REPORT OF COMMISSIONER OF FISH AND FISHERIES [18] 
k®, Teeth 40 to 50; very large and blunt. Head square. Blow-holes at the end 
of the snout. Body very large. : 
Physeter. The sperm whale. (21.) (Temper- 
ate and tropical seas. ) 
g?. Teeth in both jaws. 
3, Head without a distinct long beak and more or less rounded and globular. 
at. Teeth flattened. 
a®, A fin on the back, 
. Phocena. Common porpoises; puffing pigs. 
(12.) (Coasts of all continents. ) 
b®, No fin on the back. 
Neomeris. Finless porpoises. (13.) (Indian 
Ocean and coast of Japan.) 
b+. Teeth round. : 
c. A fin on the back. 
a’, Teeth from 16 to 24 in each jaw. 
a’. Fin on the back much higher than the pectorals are long. 
Orea. Willers. (20.) . (All seas.) 
b7, Fin on the back moderate. 
a’, Head very round. Row of teeth not extending to the corner of the 
mouth. Pectorals long and narrow. 
‘Globiocephalus. Blackfish. (18.) (All seas.) 
b8. Head very round. Row of teeth extending back to the corner of the 
mouth. Pectorals short. 
Orcella. (16.) (Coast and rivers of India.) 
c’. Head sloping. Row of teeth extending back to the corner of the 
mouth. Pectorals short. 
Pseudorca.* (19.) (Coast of Europe and of . 
New Zealand.) 
b§, Teeth in each jaw, 44 to 66. 
c’. Edges of the fin on the back curved (#. e., the dorsal fin faleate). 
Lagenorhynchus, Striped porpoises. (10.) (All 
seas.) 
d’. Edges of the fin on the back not curved (i. ¢., the dorsal fin triangular). 
Cephalorhynchus. (11. ) (Temperate Atlantic 
and Pacific Oceans. ) 
d>. No fin on the back. Color, white. 
Beluga. TheWhite whale. (14.) (ArcticSeas.) _ 
m’, Head with a distinct elongated beak. 
ct, A distinct fin on the back, not in the form of a low ridge. 
&,. Bone of the tip of the lower jaw extending as far back as the fifth or sixth 
tooth or much further (i. e., symphysis of the mandible elongate), 
ec, Teeth about 50 in each jaw. 
Steno. Long-beaked dolphins. (5.) (Tem- 
perate and tropical seas. ) 
d°, Teeth about 66 in each jaw. 
Sotalia. River dolphins. (4.) (Rivers of 
tropical America and southeastern Asia.) 
e®, Teeth from 100 to 120 in each jaw. 
Pontoporia. The Pontoporia. (3.) (Coast of - 
the Argentine Republic, South America.) 
f°. Bone of the tip of the lower jaw not extending back to the 5th or 6th 
tooth (i. e., symphysis of the mandible not elongate), 
* Another genus, named Feresia, is known only from two skulls, one of which came , 
from the ‘“‘ South Seas.” There are about 24 teeth in each jaw. The form will prob- 
ably prove to be somewhat like that of Pseudorca. 
