Family 38.—CATODONTIDÆ. (4 Genera, or Sub-Genera, 6 Species.)
General Distribution.—All the Tropical Oceans, extending north and south into Temperate waters.
This family, comprising the cachalots or sperm whales, and black-fish, are separated from the true whales by having teeth in the lower jaw and no whalebone. They are pre-eminently a tropical, as distinguished from the two preceding which are arctic and antarctic families. The spermaceti whale (Catodon macrocephalus) abounds in the Pacific Ocean and in the deep Moluccan Sea, and also in the Indian Ocean and the Mozambique Channel. In the Atlantic it is scarce, although it occasionally comes north as far as our shores.
The genera of Catodontidæ as given by Dr. Gray are, Catodon (2 species?), Warm Eastern Oceans; Physeter (1 species), "the black fish," North Sea; Cogia (2 species), South Temperate Oceans; Euphysetes (1 species), Coast of Australia.
Family 39.—HYPEROODONTIDÆ. (9 Genera or Sub-Genera, 12 Species.)
General Distribution.—Atlantic, Mediterranean, Indian Ocean, and Southern Ocean.
This family consists of the beaked whales, which have no permanent teeth in the upper jaw. The genera, according to Dr. Gray, are, Hyperoodon (2 species) "bottle-nosed whales," North Sea; Lagenocetus (1 species), North Sea; Epiodon (2 species), North and South Atlantic; Petrorhynchus (2 species), Mediterranean Sea and Southern Ocean; Berardius (1 species), New Zealand; Xiphius (1 species) North Atlantic; Dolichodon (1 species), Cape of Good Hope; Neoziphius (1 species) Mediterranean; Dioplodon (1 species), Indian Ocean.
Family 40.—MONODONTIDÆ. (1 Genus, 1 Species.)
The "Narwhal" (Monodon monoceros) which constitutes this family, is placed by Dr. Gray along with the "white whales," in his family Belugidæ. It inhabits the North Sea.
Family 41.—DELPHINIDÆ. (24 Genera or Sub-Genera, 100 Species.)