CARNIVORA. 261 



olive ; the anterior flippers apparently without nails, 

 the posterior rather small, with the inner or under- 

 most toe shortest, the rest increasing in size in regu- 

 lar succession ; the claws very small, and all with- 

 out any prolongation of the skin beyond them. It 

 was brought from the South Seas. 



0. jftavescens, the Yellow Seal of Shaw, may be 

 the young of 0. molossina of Lesson. 



"We now pass to the third group, containing the 



Trichechi, which forms the genus TRICHECHUS, 

 the Morse or Walrus, whereof not more than one 

 species is yet fully established. Their structure, ex- 

 cepting in the form and position of the tusks, with- 

 out inferior laniaries, and flat crowned molars, which 

 indicate their food to be more molluscous and vege- 

 table, is very nearly the same as that of seals : re- 

 ceding from the carnivora, they are also more strictly 

 marine, never truly on shore, but resting occasion- 

 ally on flues of ice, close to the water. 



Last of the family, we place the Macrorhme or 

 Proboscidean Seals, whose dentition, consisting en- 

 tirely of cones, approximates them to cetacea. They 

 have no external ears, large prominent eyes, the 

 males provided with a double folding dilatable skin, 

 forming a kind of proboscis, by the South Sea sealers 

 termed snotters ; have the body greatly elongated, 

 and the hinder extremities still more terminal and 

 involved in the skin ; their medial digits are little 

 conspicuous, and the external disproportio'nally lon- 

 ger and robust ; their stomachs containing only 



