THE LEOPARD SEAL 



2S7 



and almost cylindrical in section with a perceptible urethral groove to one which is 

 nearly straight, sharply elliptical in section and almost devoid of a groove. The bone in 

 the adult is not quite bilaterally symmetrical and exhibits conspicuous individual 

 variation. 



Table VIII. Growth of the os penis 



TEETH 



2 I C 



As is well known the dentition of the leopard seal is — =32, and compares favour- 

 ably with that of any other carnivore: no variations in number have been found in 

 the seventy-two specimens examined. It is a matter for regret that there is no material 

 for a description of the milk dentition. 



The frequency of broken teeth is commented on (p. 259), but as an example of an 

 advanced state of injury the very large female no. 1092 in the Royal College of Surgeons 

 may be described. The second lower left incisor is lost and the canine broken; the 

 injury to the canine and the displacements are illustrated in PI. XIII. Of the ten cheek 

 teeth in the upper jaw only four are complete, the remaining six being broken in 

 varying degrees ; some indeed are destroyed. There is only one broken cheek tooth in 

 the mandible. 



PATHOLOGICAL CONDITIONS 

 (Fig. 5) 



In skull no. B. 55, about the beginning of the ascending ramus of the right mandible 

 there are two bony nodules, one inside and the other outside and also numerous similar 

 nodules of varying size on the anterior and ventral parts, there being at least ten on the 

 palate alone. Five of these structures have been sawn through and some show a dense 

 outer layer of bone with more cancellous structure within, but others are composed of 

 dense bone throughout. In the left ethmoturbinal of the same skull there are two 

 irregularly shaped nodules which are perfectly free in the dried specimen; they are 

 both extremely dense. 



Skull no. 656 has two partly healed wounds in the bones of the face, and like similar 

 lesions seen in other skulls they have apparently been caused by another leopard seal, as 

 they are about the size one would expect to result from the use of the canines of 



