498 MR. ST. G. MIVART ON THE LEMURS. [May 20, 



Indrisin^e. 



Indris. 



I. f, C. J, Pm. J-, M. f, ={=30. 



Characters. — Ears short ; muzzle long, moderate, or rather or 

 very short ; hind limbs much longer than the fore limbs ; index 

 very short, much shorter than fifth digit ; pollex short and placed 

 far back ; hallux very long and covered with hair ; tail long, mode- 

 rate, or very short ; internal condyle of humerus perforated ; carpus 

 with or without an os intermedium ; tarsus short ; naviculare very 

 short ; sixth cervical spine long ; cervical neural laminae medianly 

 notched posteriorly ; neural lamina of seventh cervical vertebra 

 shortest after that of the atlas ; median hypapophysial ridges deve- 

 loped beneath the second to fifth cervical vertebrae ; eight lumbar 

 vertebrae ; lumbar spinous processes subquadrate, and nearly or 

 quite vertical ; transverse diameter of thorax exceeding its depth ; 

 dorsal region of spine relatively short ; cartilages of ribs slightly 

 expanding before reaching the sternum ; no hyperapophyses ; first 

 upper molar with four principal cusps, and from two to four sup- 

 plementary cusps ; last upper molar with only two well-developed 

 cusps ; the lower incisor with its outer surface longitudinally grooved ; 

 posterior lower premolar much antero-posteriorly extended ; first 



d 



t 



Dorsal aspect of left tarsus of Indris diadema. 



a, astragalus ; c, os calcis ; n, naviculare ; e, ento-cuneifovme ; m, meso-cunei- 



forme ; t, ecto-cuneiforme ; d, cuboid. 



lower molar with five more or less distinct cusps ; last lower molar 

 quinquecuspid ; a paramastoid process ; no interparietal ; lachrymal 

 foramen very near orbit ; a process depending from zygoma in front 

 of, and external to, the glenoid surface ; a glenoid foramen ; ante- 

 rior palatine foramina very large ; mandibular symphysis very long ; 

 condyle rounded, but very little transversely extended ; articular 



