CETACEA. 45 



2. KOGIA. Dorsal hump ? Blowers ? Skull short, 



broad. 



3. PHYSETER. Dorsal fin falcate. Blower on back of forehead. 



Skull elongate. 



1. CATODON. SPERMACETI WHALES. 



Head truncated and rather compressed in front, with the blow- 

 ers close together on the front of the upper edge, separated from 

 the head by an indentation. Nose of skull elongate, broad, de- 

 pressed. Lower jaw shorter than the upper one, very narrow, 

 cylindrical in front, and united by a symphysis for nearly half then- 

 length . Back with a roundish tubercle in front, over the eyes, 

 called the " bunch," and a rounded ridge of fat behind, highest 

 in front over the genital organs, called the " hump," and conti- 

 nued in a ridge to the tail. No true dorsal fin. Pectoral broad, 

 truncated. Teeth conical, often worn down. Males larger than 

 the females. 



The atlas is distinct ; the other cervical vertebrae are soldered 

 together. Duvernoy, I. c. i. 195. 



Catodon, Artedi, Syst.; Lacep. Cet.; Rafin. Anal. Nat. 60, 1815 ; 



Oken, Lehrb. Nat. 678. 



Physeter (Catodontes), Fischer, Syn. Mam. 517. 

 Physeter, sp., Linn.-, Illiger, Prod. 143, 1811; Lesson, N. Reg. 



Anim. 201. 



Physeter, Wagler, N. S. Amph. 33. 



Physalus, Lacep. Get. 219. t. 9, from Anderson, Cacholotte, t. 4. 

 Balaenoptera (Physalus), Fischer, Syn. Mam. 519. 

 ? Notaphrum, Rafin. Anal. Nat. 60, 1815 (no char, nor type). 

 Cetus (pars), Oken, Lehrb. Naturg. 674. 



The teeth in the lower jaw (in young specimens 16 feet long) 

 had not yet come through. Jackson, I. c. 140. Capt. Benja- 

 min Chase states that he has more than once seen teeth of a 

 considerable size in the upper jaw of the adult females, though 

 always covered by the gum. The males, he says, being much 

 larger, are cut up differently, and in such a way as not to expose 

 the teeth. Jackson, Boston Mag. N. H. v. 140. 



The upper ja\v is not altogether toothless, as usually described. 

 It has on either side a short row of teeth, which for the most part 

 are placed more interior than the depressions which receive the 

 teeth of the lower jaw, though they sometimes also occupy the 

 bottom of these cavities. Their entire length is 3 inches ; they 

 are curved backwards and elevated about half an inch above the 

 soft parts, in which they are deeply imbedded, having only a slight 

 attachment to the maxillarv bone. In tw r o instances I have found 



