ROCK SHELLS,
Are so called on account of their rough and wrinkled forms; they are nearly allied to the Whelks, to which they bear a close resemblance. Several species are found on our shores, the most common being the Humble Murex, (M. despectus,) from the Latin despecto—to despise; this is often used by the fishermen for bait. Some of the foreign Rock Shells are very curious and beautiful; three of them will be found on [Plate II.]—Figs. 1, 2, and 3. The Common Thorny Woodcock, (M. tribulus,) from the French for trouble, whence we have also tribulation, which is sometimes said to be a thorny path. This curious shell is also called Venus’ Comb. It is found in the Indian Ocean, from whence it is also brought. Fig. 2, the Woodcock’s Head, (M. haustellum,) from the Latin haustus—a draught; the bill of the Woodcock being adapted for sucking. This term is also applied to insects that live by suction. The shell, it will be seen, is destitute of spines, but it is ribbed and beautifully marked. Fig. 3 is worthy of its name—the Royal Murex, (M. regius,) from regno—to reign. It is a splendid species, of the rich colouring of which, art can give but a faint impression. It is brought from the western coast of Central and South America, where, as well as in the islands of the South Pacific, many new shells of the genus Murex have been discovered.
One shell found on our own coast, often mistaken for a Whelk, is the Pelican’s-foot Strombus, called in scientific language, Strombus pes-pelicanus, which is but a Latinized form of the English name. This shell varies greatly in shape in different stages of its growth, and by an inexperienced conchologist, the young, middle-aged, and old Strombus, might be taken for distinct species. In the Strombidæ family, so called we know not why, the same word in Latin meaning a kind of shell-fish, are some species which have produced pearls. One member of the family which we sometimes see in collections, is a large and very beautiful shell; this is the Broad-winged Strombus, (S. latissimus,) probably from latesco—to wax or grow broad, or large; issimus being in the superlative degree, would indicate that this shell was very much so, as we find it is, sometimes measuring as much as twelve inches across. In [Plate II], is a representation of this handsome shell, greatly reduced in size, of course: see Fig. 4. We here give a figure, as more curious than beautiful, of the Scorpion Pteroceras, (P. scorpius,) which also belongs to the Strombidæ family; as does the curious Chinese Spindle, (Rostellaria rectirostris.) The generic name of the first of these species, comes from the Greek Ptero, pronounced tero, meaning a wing, and cerus—waxen. Both the generic and specific names of the second refer to the peculiar conformation of the shell, being derived from the Latin, and meaning a straight line or beak.
On [Plate III], will be found the Imbricated Purpurea, (P. imbricata,) Fig. 1, which claims a close alliance with the Whelks. The generic name has reference to the dye yielded by this, as well as all the shells of the genus; the specific name comes from the Latin imbrex—the gutter-tile; thus imbricated, a term often used in Natural History, means ridged, like the roof of a house, where the tiles are placed to overlap each other, so that the rain will run off. The Persian Purpura, or, as it is called in Latin, Purpura Persica, Fig. 2, is another handsome shell of this family group; its name indicates the place where it is found. The other species described comes from South America, and the P. lapillus, (the meaning of the specific name has already been explained,) is common on our shores, being found in great abundance on the rocks at low waiter. We read in scripture, of Tyrian purple, and there is every reason to suppose that the rich colour was obtained from these and other shell-fish.