MAMMALIA. PINNIPEDIA. 369 



JEluroidea 1 , including the cats, civets, hyaenas, and allied 

 forms. 



Cynoidea, including the dog tribe. 



Arctoidea, including the bears, raccoons, weasels, and allied 

 forms. 



Suborder (3). PiNNiPEDiA 2 . 



In this suborder the limbs are greatly modified and adapted 

 for a more or less purely aquatic life, the proximal and middle 

 segments of the limbs are shortened, while the distal segment, 

 especially in the leg, is much elongated and expanded. There are 

 always five well-developed digits to each limb, and in the pes the 

 first and fifth digits are generally larger than the others. The 

 digits generally bear straight nails instead of claws, but even 

 nails are sometimes absent. There is no carnassial tooth, and 

 the teeth in other ways differ considerably from those of Carni- 

 vora vera. The incisors are always fewer than ; while the 

 cheek teeth generally consist of four premolars and one molar, 

 all of very uniform character, being compressed with conical 

 crowns, and never more than two roots. 



The suborder includes three families Otariidae (Eared 

 Seals), Trichechidae (Walrus), and Phocidae (Seals). 



Order 7. INSECTIVORA 3 . 



This order contains a large number of small generally ter- 

 restrial mammals. The limbs are plantigrade or subplantigrade, 

 and are generally pentedactylate. All the digits are armed 

 with claws, and the pollex and hallux are not opposable. The 

 teeth are diphyodont, heterodont, and rooted. The cheek teeth 



1 St G. Mivart, The Cat, London, 1881. 



2 St G. Mivart, P. Z. S., 1885. 



3 St G. Mivart, "On the Osteology of Insectivora, " J. Anat. PhysioL 

 norm, path., 1867 and 1868, and P. Z. S., 1871. G. E. Dobson, Monograph 

 of the Insectivora, London, 188290. 



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