INTRODUCTION. 67 



32. Ph. barbata. Great Seal. Teeth very small, grinders 

 three-lobed, direct ; fore-feet with the third toe longest. P. 

 212. 



33. Ph. Gryphus. Grey Seal. Grinders conical, distant. 

 P. 214. 



16. TRICHECHUS. 



Body large, covered with short stiff hairs ; tusks and in- 

 cisors wanting in lower jaw ; feet very short, webbed. P. 

 147. 



34. T.Rosmarus. Walrus or Sea Horse. P. 219. 



IV.-RODENTIA. 

 Two incisors in each jaw. P. 225. 



17. SCIURUS. 



Grinders five above, four below ; tail long, bushy, with the 

 hairs directed laterally. P. 226. 



35. Sc. vulgaris. Squirrel. P. 229. 



18. MYOXUS. 



Grinders four above, four below ; tail long, slender, with 

 the hairs directed laterally. P. 227. 



36. M* avellanarius. Dormouse. P. 234. 



19. Mus. 



Grinders three above, three below; tail long, tapering, 

 scaly, and nearly bare. P. 227. 



37. M. liattus. Black Rat. Greyish-black; tail longer 

 than the head and body. P. 238. 



38. M decumanus. Brown Rat. Greyish-brown above, 

 greyish-white beneath, ears a third of the length of the head ; 

 tail shorter than the head and body. P. 243. 



39. M. musculus. Domestic Mouse. Greyish-brown 

 above, yellowish-grey beneath, ears half the length of the 

 head ; tail a little shorter than the head and body. P. 250. 



40. M. sylvaticus. Wood Mouse. Reddish-brown 

 above, greyish-white beneath, with a light reddish spot on 

 the breast, ears scarcely half the length of the head. P. 254. 



41. M. messorins. Harvest Mouse. Light reddish- 

 brown above, white beneath ; ears one-third of the length of 

 the head. P. 257. 



