500 MK. ST. G. MIVART ON THE LEMURS. [May 20, 



fourth cervical vertebrae, dorsal, and nine lumbar vertebrae ; dorsal 

 region of spine short ; no intermedium to the carpus ; length of os 

 calcis less than one fourth that of tibia ; naviculare not nearly twice 

 the length of cuboid. 



Lemur. 



I. i C. 1 Pm. |, M. |, =4=34. 



Tail long ; muzzle elongated ; upper incisors subequal, both pairs 

 anterior to the canines ; first upper premolar shorter than the second ; 

 all upper premolars with only one large external cusp ; first upper 

 molar considerably exceeding the third premolar in size ; upper ca- 

 nines very large ; sphenoidal fissure and foramen rotundum normally 

 distinct ; angle of mandible not produced downwards ; mastoidal re- 

 gion of periotic not inflated ; dorsal and lumbar vertebrae together 

 not more than twenty ; tarsus short ; os calcis less than one-fourth 

 the length of tibia ; naviculare little more than half the length of 

 the cuboid. 



Fig. 13. 



Dorsal aspect of left tarsus of Lemur. 

 (Letters as before.) 



Hapalemur. 



I. 4, C. |, Pm. 4, M. 4, =4=34. 



Tail long ; muzzle short ; upper incisors unequal, the posterior 

 one on each side being quite internal to the canine, which is small. 

 First premolar above longer than the second, but the dental series 

 on each side very nearly equal ; third premolar above shaped like 

 the upper molars, which it exceeds in size : a paroccipital process ; 

 a large malar foramen ; angle of mandible exceedingly large and 



