60 CETACEA. ie 
*** Upper and lower jaw with compressed, permanent teet, bal 
6. Neomerts. Dorsal none. 
7. PHocazna. Dorsal triangular, in the middle of the back. 
c. Upper and lower jaw with many teeth, rarely deciduous 
with age. Wings of the jaw-bone horizontally produced 
over the orbits. Delphinina. 
* Head rounded in front, not beaked. Nose of skull scarcely 
so long as the brain-cavity. Dorsal distinct. 
8. Grampus. Teeth conical, truncated, early deciduous. In- 
termaxillaries broad. Pectoral ovate. : 
9. GLOBIOCEPHALUS. Teeth conical, deciduous when old. 
Intermaxillaries very broad. Pectorals narrow, linear. 
10. Orca. Teeth conical, acute, permanent. Intermaxillaries: 
moderate. Pectorals ovate. : 
** Head beaked. Nose of skull as long as or longer sin the 
brain-cavity. 
11. LAGENoRHYNcHUS. Head shelving in front. Dorsal ra- 
ther posterior. Nose of skull depressed, expanded. 
12. DetpHinarrervs. Head rather convex in front. Dorsal 
none. Nose of skull rather depressed, convex above. . 
13. DeLeHiInus. Head rather convex in front. Dorsal medial. ; 
Nose of skull rather depressed, convex above. . 
14. Steno. Head rather convex im front. Dorsal medial. 
Nose of skull compressed, higher than broad. Symphysiay 
of lower jaws rather elongate. . 
_ 15. Ponroporta. Head rather convex in front. Dorsal me- 
dial. Nose of skull rather compressed: high symphysis 
of lower jaw very long. 
B. Jaws much compressed. Symphysis of the lower jaw very 
long. Dorsal none. Teeth in both jaws. Fluviatile. 
d. Skull with the mazillary bones simple, eapanded over the 
orbit. Teeth conical. Paddles ovate or oblong. Tniana. | 
16. Inia. Teeth rugose, the ne, ones with a rounded a cle 
on the mner side. ey 
