172 Zoological Society :— 
b. Dorsal fin distinct ; belly plaited ; baleen short and broad ; 
vertebre of neck more or less free ; pectoral lanceolate. 
2. Mrearrera. Pectoral fin elongate. Dorsal fin low, truncate. 
ie) 
. BaALzNopTERA. Pectoral fin moderate. Dorsal fin falcate, 
two-thirds the entire length from nose. Vertebree 46 or 48. 
4. Puysatvus. Pectoral fin moderate. Dorsal fin faleate, three- 
fourths the entire length from nose. Vertebre 54-64. 
Fam. 2. CATODONTID&. 
Head large, subcylindrical, blunt. Lower jaw narrow. Teeth 
large, in the lower jaw only, fitting into pits in the gums of the 
upper one. Nostrils separate, one often abortive. The hinder edge 
of the maxillary elevated, forming a concavity on the forehead of 
the skull. Pectoral broad, truncated. 
* Head subcylindrical, truncated ; nostril in front of the truncated 
head ; dorsal hump rounded. 
1. Caropon. Head very large, one-third of the entire length of 
the animal. 
** Fead depressed, rounded in front ; nostrils in the forehead ; 
dorsal fin falcate. 
2. Puyseter. Uead very large, one-third of the entire length of 
the animal, rounded, convex above. Teeth conical, compressed. 
Skull elongate ? 
3. Kogia = Luphyseter, Wall. Head short, very broad. Forehead 
convex. Teeth conical, cylindrical. Skull very short and broad. 
Fam. 3. PLATANISTID. 
Head small, long-beaked, beak compressed. Teeth in both jaws, 
at first cylindrical, becoming compressed. Blowers linear, parallel, 
over the eyes. The sides of the maxilla elevated,. forming a vaulted 
cavity over the forehead. Pectoral broad, truncated. 
1. PLATANISTA. 
Il. Nostrils united into a single transverse or crescent-shaped blower. 
Head moderate, more or less beaked. Teeth in both jaws, often 
deciduous. The pectoral fin lanceolate, tapering. 
Fam. 4. Iniapz. 
The head beaked, beak hairy. Teeth rugulose, crown with an 
internal process. Back without any fin, keeled behind. Pectoral 
fin large. . 
1. Int. 
Fam. 5. DeLPHINID. 
Head more or less beaked, smooth. ‘Teeth simple, cylindrical, 
conical, smooth. Back rounded. Dorsal fin distinct, falcate, rarely 
wanting. 
