PHYSETERIDA. — CXCIII. 353 
a. Dorsal fin present, behind middle of back; teeth 18 to 30, very sharp; 
head bluntish but not truncate ; ee on top of head; length about 20 
Pett a) cae gael alt gee ~ « « + Kogta, 578. 
aa, Dorsal fin wanting; teeth 40 to 50, lai net bands head very long and 
deep, truncate in front, the cavity of the snout filled with oil and sper- 
maceti; spiracles in front of head; length 60 to 80 feet. 
PHYSETER, 579. 
578. KOGIA Gray. 
1102. K. breviceps (Blainville). Piamy Srerm WHALE. 
Warm seas, occasional on our coast. (Iat., short-headed.) (Zu.) 
(K. grayi, goodei, etc.) 
579. PHYSETER Linnzus. (dvonrnp, a whale, from gducdo, 
to blow.) 
1103. P. macrocephalus L. SprerM WHALE. CACHALOT. 
Blackish, paler below. Open sea, commonest far S.; one of the 
most valuable of the whales. L. ¢ 80 feet; 9 much smaller. (Hu.) 
(uaxpds, long; Kepadn, head.) 
Famity CXCIV. BALAMNIDA. (Tue True Waa tes.) 
Teeth disappearing before birth, their place taken in the upper 
jaw by an array of parallel plates with fringed edges, known as 
baleen or whalebone. Eye very small, placed close to angle of 
mouth. Spiracles separate, comparatively simple in structure ; 
lower jaw very large and thick, its edge convex upward. Genera 
8, species about 20; huge creatures, mostly of the colder seas, 
feeding chiefly on small animals and sought by man for the sake of 
the oil (blubber), and the whalebone. 
a. Belly with conspicuous longitudinal furrows; pectorals shorter than head. 
6. Dorsal fin well developed. 
c. Dorsal fin much nearer tail than head. 
d. Whalebone slaty or pale; beak rather acuminate. PHysatus, 580. 
dd. Whalebone black ; beak rather obtuse. . . SrBBALDIUS, 581. 
cc. Dorsal fin nearly median. . . - « BALANOPTERA, 582. 
bb. Dorsal fin obsolete; back with a fleshy ump 3 ; belly with furrows; pec- 
toralaslongashead. . . . + MEGAPTERA, 583. 
aa. Belly without furrows; dorsal fin sbenlets, 
eé. Whalebone short and white (1 to 2 feet long). . . AGAPHELUS, 584. 
ee. Whalebone very long and blackish (7 to 12 feet long). Batawna, 585. 
580. PHYSALUS Gray. (dvcados, whale, from duada, to blow.) 
1104. P. physalus (L.). Common Rorquat. FINNER. FIn- 
BACK. Razor-Back. Black above, paler below. lL. 70 feet. 
N. Atl. (£u.) (P. antiquorum Gray; Balenoptera boops, and 
musculus L.) 
