CETACEA. 57 



veoli, like those which bees keep their honey in, and in these 

 were round masses of a white substance, which, upon examination, 

 were proved to be sperm. Some of this substance was also found 

 externally on the head, in some parts to the thickness of 2 feet. 

 In the superior jaw were 42 alveoli, hollowed out for receiving 

 the teeth of the lower jaw; they were of a cartilaginous nature. 

 In the inferior mandible there were 42 teeth, 21 on each side, all 

 of the same form, which was like that of a sickle, round and a 

 little compressed, thicker and more arched in the middle, and 

 gradually becoming thinner, terminating superiorly in an acute 

 cone turning inwards ; inferiorly it becomes thinner, and termi- 

 nates in a more slender root, which is narrower in the middle. 

 Of these teeth those in the middle of the jaw are larger and 

 heavier, those external are smaller. One of the larger, 9 inches 

 long, weighed 18| oz., and at the thickest end was of the same 

 length as breadth. The smallest tooth w r hich I got was 7 inches 

 long and 5 in girth. The osseous part of these teeth projected 

 3 inches beyond the gums, was like polished ivory, smooth and 

 white ; the fang of each tooth was provided with a large cavity, 

 which was so constructed that in the larger teeth there was a 

 cavity 3 inches deep. It had two lateral fins, each about 4 feet 

 long, and besides these a long fin on the back. Colour of skin 

 black. The throat was observed to be larger than usual in whales. 

 Only one stomach was found." 



The two individuals seen by Sibbald have been divided into 

 two species, according to the more or less truncated state of the 

 teeth. 



In the Catalogue of the Museum of the College of Surgeons, 

 the truncated Whale's-teeth are called " the teeth of the Hi'h- 

 finned Cachalot, P. Tursio?" p. 171, n. 1189-1194. And the 

 small jaws of the Sperm Whale are called " the Lesser Cachalot 

 (Physeter Catodon, Linn.)." 



See also Physeter sulcatus (Lacep. Mem. Mus. iv. 4/5), from 

 a Japanese drawing, with the dorsal fin over the pectoral and the 

 jaws grooved. 



Fam. 3. DELPHINIDJ3. DOLPHINS. 



Head moderate. Teeth in both jaws, rarely rudimentary and 

 early deciduous. Blowers united together, forming a single trans- 

 verse or lunate opening on the crown of the head. 



Diodonea and Delphinia (pars), Rqfin. Anal. Nat. 1815, 60. 

 Cete, Carnivora, pars, Lesson, N. Reg. Anim. 197- 

 Hydraula, Ch. Bonap. Reg. Anim. 

 Delphinusidese, Lesson, N. Reg. Anim. 197. 



c 5 



