1873.] MR. ST. G. MIVART ON THE LEMURS. 499 



surface prolonged somewhat down the back of ascending ramus ; di- 

 gastric fossa more or less deep. 

 Hab. Madagascar exclusively. 



Lemurin^;. 

 I. y or f, C. }, Pm. f, M. f, = 7 -^=32 or 34. 



Carpus with or without an os intermedium ; os calcis less than 

 one fourth the length of tibia ; naviculare from about half to nearly 

 twice the length of the cuboid ; cartilages of ribs not expanded be- 

 fore piercing the sternum ; no hyperapophyses ; spinous processes 

 of lumbar vertebrae elongated, and much inclined forwards ; caudal 

 vertebrae with chevron bones. 



Hab. Madagascar exclusively. 



Lepilemtjr. 



I. |, C. |, Pm. f, M. f, =1=32. 



Tail shorter than the body ; muzzle longer than the orbit ; first 

 upper premolar more vertically extended than the others ; premolars 

 with only one external cusp ; last lower molar with a large fifth 

 cusp ; prsemaxillae very small ; an interparietal bone ; palate very 

 short ; posterior palatine foramina small ; a small molar foramen ; 



Fig. 12. 



Dorsal aspect of left tarsus of Lepilemur mustclinus. 

 (Letters as before.) 



sphenoidal fissure and foramen rotundum together represented by a 

 single opening ; angle of mandible produced downwards as well as 

 backwards ; mastoidal region of periotic inflated ; articular surface of 

 condyle remarkably prolonged downwards behind ; cervical neural 

 laminae slightly notched posteriorly ; a very conspicuous median 

 hypapophysial ridge and process beneath the second, third, and 



32* 



