48-1 MAMMALIA. 



posterior feet only; the phalanxes of both enveloped in the 

 skin ; the tail short and thick ; they have four abdominal teats. 

 In this genus, Cuvier seems to have paid little regard to ex 

 ternal form, as in this respect the animals which he brings to- 

 gether are very different ; taking the dentition alone for his cha- 

 racter. 



Sub -Genus I. — Phoca. — Peron. — Without external ears; 

 incisory teeth with a simple edge; grinders edged; toes of the 

 hind feet terminated by pointed nails, placed on the border of 

 the membrane. 



Phoca vitulina.— -The Common Seal. — Plate XIV. fig. 3. 

 Described, vol. II. p. 386. 



Sub ^ Genus II. — Mirunga. — Graij. — Cutting teeth * or J; 

 canines J-} ; grinders short, broad, and roots simple ; crown 

 striated and nearly flat ; no external ears ; fur crowned on the 

 nose, elongated into a trunk. 



Phoca cristata — Crested Sea-Lion. — Top of the head fur- 

 nished with a moveable hood, susceptible of erection, and cover, 

 ing the eyes and muzzle. From seven to eight feet long. In- 

 habits the Northern Seas. — Type of M. F. Cuvier's genus 

 Slematope. 



Sub-Genus III — Otario. — Peron Cutting teeth ^ ; ca- 

 nines J^p large ; grinders |-| ; root simple ; crown with a prin- 

 cipal conical point, and one little lineal lobe before and apother 

 behind it ; external ears distinct. 



Phoca ursina The Sea Bear. — Plate XIV. fig. 4. — De- 

 scribed, vol. II. p. 388. — The Ursine Seal — This is the 

 type of M. F. Cuvier's Arctocephale. 



Genus 60. — Trichecus. — Linnaus. 



Generic Character Incisory teeth ^, canine teeth i^, grind- 

 ers ^—^ ; total 24. The incisory teeth are small and deciduous ; 

 the superior canines or tusks, very large, somewhat longer than 

 the head, compressed, and laterally arched ; the grinders are of 

 a cylindrical shape, with their upper surface obliquely truncated; 

 the lio.ly is long and conical ; the head round ; muzzle large ; 

 without any external ears ; tail short ; fore feet paddle-sbaped. 



