A. with the head of moderate size. Family DELPHINiDiE. Teeth in both jaws, all of simple structure, and gene rally conical form. No ccecum.
Genus DELPIIINORHYNCHUS. Rostrum very long and narrow, continued not abruptly from the forehead. Teeth very small and numerous.
Ex. Delphinorhynchus micropterus. (Fred. Cuvier Cetaces, pl. viii. fig. 1.) Genus I5ELPHINUS. Rostrum narrow, of moderate length, continued abruptly from the forehead. Teeth conical, slightly recurved, numerous.
, Ex. Delphinus Delphis, the common Dol phin; Delphinus Tursio, the Spouter or small Bottle-nose Whale of Hunter.
For the other numerous species of this genus consult F. Cuvier, IIistoire des Cetaces, p. 147 et seq.
Genus INIA. Rostrum, as in the genus Delphinus. Teeth mammilliform.
Species. Inia Boliviensis ; (Fred. Cuvier, Cetaces, pl. x, bis, and xi, cranium); inhabits the great rivers of South Ame rica.
Genus, PfloC/ENA. Rostrum short, broad. Teeth conical or compressed.
Ex. Phoccena communis, the common Porpoise; Phocana orca, the Grampus; Phoccena globiceps, L'Epaulard, Cuv. Phocana leucas, the Beluga,* &c.
The following genera seem to form the types of as many distinct families of Zoophagous Cetaceans.
Genus MONODON. Rostrum short and broad. No other teeth save two in the upper jaw in the form of tusks, situated horizontally, and both of which continue in the rudimental condition in the female, while in the male one projects far be yond the jaws in the line of the axis of the body.
Ex. Monodon monoceros, Linn. The Narwhal.
Genus HYPEROODON. Rostrum of mo derate length, extending abruptly from a very elevated cranium. Two small
teeth in the lower jaw ; small callous tubercles on the palate.
Ex. Hyperoodon Dalei ; the great Bottle nose Whale of Hunter.
Genus PLATA N ISTA . ROStrIIM Very long and compressed, enlarged at the extre mity. 'Teeth numerous ; in both jaws conical and recurved. Cranium enlar ged by osseous processes. A ccecum.
Ex. Plutanista Gangetica. The Gangetic Dolphin.
B. IVith the head of immoderate size, equalling one-third the length of the body.
Family I. CATODONTID/E. Teeth nu merous, conical, but developed only in the lower jaw. External nostrils or blow-holes confluent ; no ccecum.
Genus CATODON. No dorsal fin.
Ex. Catodon macrocephalus ; Physeter macrocephalus, Shaw. The great Sper maceti Whale.
Genus PHYSETER. A dorsal fin.
Ex. Physeter Tursio, Linn. The MAI finned Cachalot, Shaw.
Family BAL/ENID/E. No teeth their place supplied by the plates of 'baleen or whalebone attached to the upper jaw. Blow-holes distinct; a coxum.
GeMIS BALMNOPTE RA . A dorsal fin ; pectoral integument plicated ; baleen plates short. ( See .fig. 259.) Species. Balanoptera Boops, Cuv.; the Jubarte or great Rorqual.
Baleenoptera rostrata, Lacep.; the Piked Whale of Sibbald and Hunter, sus pected by Cuvier to be the young state of the Bakenoptera Boops.
Bakenoptem Musculus, Cuv.; the Me diterranean Rorqual.
Bakenoptera Antarctica, Cuv.; the South ern or Cape Rorqual.
Genus BA LMNA. No dorsal fin; pectoral integument smooth; baleen-plates long.
Species. Balcena mysticetus, Linn. The great Whalebone Whale of Hunter ; great Mysticete.
Baleena Australis,Cuv. The Cape Whale.]