Captain Scoresby tells us that he had seen the walrus with its head above water, and in such a position that it required little stretch of imagination to mistake it for a human being, and that on one occasion of this kind the surgeon of his ship actually reported to him that he had seen a man with his head above water.
Peter Gunnersen's merman (p. 24), who "blew up his cheeks and made a kind of roaring noise" before diving, was probably a "bladder-nose" seal. The males of that species have on the head a peculiar pad, which they can dilate at pleasure, and their voice is loud and discordant.
The appearance and behaviour of Steller's "sea-ape," described on p. 25, may, I think, be attributed to one of the eared seals, the so-called sea-lions, or sea-bears. Every one who has seen these animals fed must have noticed the rapidity with which they will dive and swim to any part of their pond where they expect to receive food, and how, like a dog after a pebble, they will keenly watch their keeper's movements, and start in the direction to which he is apparently about to throw a fish, even before the latter has left his hand. This may be seen at the Zoological Gardens, Regent's Park, and, better than anywhere else in Europe, at the Jardin d'Acclimatation, Paris. It would be quite in accordance with their habits that one of these Otaria should dive under a ship, and rise above the surface on either side, eagerly surveying those on board, in hope of obtaining food, or from mere curiosity.
The seals and their movements account for so many mermaid stories, that all accounts of sea-women with prominent bosoms were ridiculed and discredited until competent observers recognised in the form and habits of certain aquatic animals met with in the bays and estuaries of the Indian Ocean, the Red Sea, the west coast of Africa, and sub-tropical America, the originals of these "travellers' tales." These were—first, the manatee, which is found in the West Indian Islands, Florida, the Gulf of Mexico, and Brazil, and in Africa in the River Congo, Senegambia, and the Mozambique Channel; second, the dugong, or halicore, which ranges along the east coast of Africa, Southern Asia, the Bornean Archipelago, and Australia; and, third, the rytina, seen on Behring's Island in the Kamschatkan Sea by Steller, the Russian zoologist and voyager, in 1741, and which is supposed to have become extinct within twenty-seven years after its discovery, by its having been recklessly and indiscriminately slaughtered.[ [68] ] Then science, in the person of Illeger, made the amende honorable, and frankly accepting Jack's introduction to his fish-tailed innamorata, classed these three animals together as a sub-order of the animal kingdom, and bestowed on them the name of the Sirenia. This was, of course, in allusion to the Sirens of classical mythology, who, in later art, were represented as having the body of a woman above the waist, and that of a fish below, although the lower portion of their body was originally described as being in the form of a bird.
It has been found difficult to determine to which order these Manatidæ are most nearly allied. In shape they most closely resemble the whales and seals. But the cetacea are all carnivorous, whereas the manatee and its relatives live entirely on vegetable food. Although, therefore, Dr. J. E. Gray, following Cuvier, classed them with the cetacea in his British Museum catalogue, other anatomists, as Professor Agassiz, Professor Owen, and Dr. Murie, regard their resemblance to the whales as rather superficial than real, and conclude from their organisation and dentition that they ought either to form a group apart or be classed with the pachyderms—the hippopotamus, tapir, etc.—with which they have the nearest affinities, and to which they seem to have been more immediately linked by the now lost genera, Dinotherium and Halitherium. With the opinion of those last-named authorities I entirely agree. I regard the manatee as exhibiting a wonderful modification and adaptation of the structure of a warm-blooded land animal which enables it to pass its whole life in water, and as a connecting link between the hippopotamus, elephant, etc., on the one side, and the whales and seals on the other.
The Halitherium was a Sirenian with which we are only acquainted by its fossil remains found in the Miocene formation of Central and Southern Europe. These indicate that it had short hind limbs, and, consequently, approached more nearly the terrestrial type than either the manatee, the rytina, or the dugong, in which the hind limbs are absent. The two last named tend more than does the manatee to the marine mammals; but there is a strong likeness between these three recent forms. They all have a cylindrical body, like that of a seal, but instead of hind limbs there is in all a broad tail flattened horizontally; and the chief difference in their outward appearance is in the shape of this organ. In the manatee it is rounded, in the dugong forked like that of a whale, in the rytina crescent-shaped. The tail of the Halitherium appears to have been shaped somewhat like that of the beaver. The body of the manatee is broader in proportion to its length and depth than that of the dugong. In a paper read before the Royal Society, July 12th, 1821, on a manatee sent to London in spirits by the Duke of Manchester, then Governor of Jamaica, Sir Everard Home remarked of this greater lateral expansion that, as the manatee feeds on plants that grow at the mouths of great rivers, and the dugong upon those met with in the shallows amongst small islands in the Eastern seas, the difference of form would make the manatee more buoyant and better fitted to float in fresh water.
In all the Manatidæ the mammæ of the female, which are greatly distended during the period of lactation, are situated very differently from those of the whales, being just beneath the pectoral fins. These fins or paws are much more flexible and free in their movements than those of the cetæ, and are sufficiently prehensile to enable the animal to gather food between the palms or inner surfaces of both, and the female to hold her young one to her breast with one of them. Like the whales, they are warm-blooded mammals, breathing by lungs, and are therefore obliged to come to the surface at frequent intervals for respiration. As they breathe through nostrils at the end of the muzzle, instead of, like most of the whales, through a blow-hole on the top of the head, their habit is to rise, sometimes vertically, in the water, with the head and fore part of the body exposed above the surface, and often to remain in this position for some minutes. When seen thus, with head and breast bare, and clasping its young one to its body, the female presents a certain resemblance to a woman from the waist upward. When approached or disturbed it dives; the tail and hinder portion of the body come into view, and we see that if there was little of the "mulier formosa superne," at any rate "desinit in piscem." The manatee has thence been called by the Spaniards and Portuguese the "woman-fish," and by the Dutch the "manetje," or mannikin. The dugong, having the muzzle bristly, is named by the latter the "baardmanetje," or "little bearded man." There are no bristles or whiskers on the muzzle of the manatee; all the portraits of it in which these are shown are in that respect erroneous. The origin of the word "manatee" has by some been traced to the Spanish, as indicating "an animal with hands." On the west coast of Africa it is called by the natives "Ne-hoo-le." By old writers it was described as the "sea-cow." Gesner depicts it in the act of bellowing; and Mr. Bates, in his work, "The Naturalist on the Amazon," says that its voice is something like the bellowing of an ox. The Florida "crackers" or "mean whites," make the same statement. Although I have had opportunities of prolonged observation of it in captivity, I have not heard it give utterance to any sound—not even a grunt—and Mr. Bartlett, of the Zoological Gardens, tells me that his experience of it is the same. His son, Mr. Clarence Bartlett, says that a young one he had in Surinam used to make a feeble cry, or bleat, very much like the voice of a young seal. This is the only sound he ever heard from a manatee.[ [69] ]
I believe the dugong to be more especially the animal referred to by Ælian as the semi-human whale, and that which has led to this group having been supposed by southern voyagers to be aquatic human beings. In the first place, the dugong is a denizen of the sea, whereas the manatee is chiefly found in rivers and fresh-water lagoons; and secondly, the dugong accords with Ælian's description of the creature with a woman's face in that it has "prickles instead of hairs," whilst the manatee has no such stiff bristles.
In the case of either of these two animals being mistaken for a mermaid, however, "distance" must "lend enchantment to the view," and a sailor must be very impressible and imaginative who, even after having been deprived for many months of the pleasure of females' society, could be allured by the charms of a bristly-muzzled dugong, or mistake the snorting of a wallowing manatee for the love-song of a beauteous sea-maiden.