78 OSTEOLOGICAL GALLERY. 



ing such slippery prey as the fishes on which Seals feed ; but the 

 teeth are useless for biting the prey into small pieces, each fish 

 being invariably swallowed whole. Some of the Seals have their 

 teeth provided with additional sharp-pointed cusps along their 

 edges, as in the Sea-Leopard (Stenorhynchus leptonyx] (fig. 36). 



This description applies fully only to the true Seals or Phocida, 

 the Otariida, or Eared Seals, resembling ordinary Carnivores far 

 more, especially in the position of their hind limbs, as already 

 explained on p. 21. 



The Walrus is in many ways intermediate between these two 

 families, but its dentition is very remarkable, the canine teeth 

 being enormously developed, while all the other teeth are small and 

 rudimentary and with flattened crowns. A skeleton of this animal 

 is exhibited in the recess between Cases 7 and 8, and several skulls 

 and tusks are in Case 7, Division D. 



Order III. INSECTIVORA. 



[Case 8.] The Insectivora (Case 8 A) are a group of animals not easily 

 defined by common osteological characters, and containing many 

 forms in which parts of the skeleton are remarkably modified. 

 Their teeth are strong and well developed, and, in the majority, 

 clearly separable into the usual divisions ; but in some, such as the 



Fig. 37. 



A 



Dentition of (A) Tanrec (Centetes ecaudatus) and (B) Hedgehog 



(Erinaceus europceus). 

 c, canines ; i, incisors j m, molars ; pm, premolars. 



