720 



imperforate, consisting only of the diapophysis ; that on the right side has the rudiment of a 

 rib attached to it. A broad pleurapophysial plate extends outwards from below the diapophysis 

 of the sixth cervical. The spines of the third to the sixth cervicals inclusive are very small. 

 The metapophysis begins to be developed in the middle dorsal vertebrae, and, in the tenth, 

 projects above, but distinct from, the diapophysis. In the eleventh the diapophyses have 

 disappeared, and the metapophysis is on the outside of the prozygapophysis. From this 

 vertebra a well-marked anapophysis is developed, which is continued from all the succeeding 

 vertebrae. The diapophysis reappears upon the first lumbar, and increases in length and 

 breadth as the other lumbar vertebrae approach the sacrum. The centre of motion of the 

 back is indicated by the vertical spine of the tenth dorsal vertebra, towards which those of 

 the other dorsal and of the lumbar vertebrae incline. Seven pairs of ribs directly join the 

 sternum, which consists of seven bones. Both coracoid and acromial processes are nearly 

 equally developed. The humerus is perforated above the inner condyle, but not between the 

 condyles. The patellae are well developed ; and two small fabellse are preserved behind the 

 condyles of the left femur. 



The sutures of the cranium are nearly obliterated. The paroccipitals are absent, and 

 the root of the zygoma is pierced by a venous foramen. There are large petrotympanic 

 bullae. The rim of the orbit is entire, but the cavity communicates freely with the temporal 



fossae. 



Purchased. 



4636. The skeleton of the Lemur nigrifrons. 



The vertebral formula is : 7 cervical, 12 dorsal, 7 lumbar, 3 sacral, and 27 caudal. In 

 both these skeletons the fore part of the maxillaries at the sides of the nostrils has been 

 diseased. 



Mm. Brookes. 



4637. The skull of the Lemur nigrifrons. 



The teeth have been removed from the left side of both upper and lower jaws, and are 



separately displayed, 



Hunter ian. 



4638. The skeleton of the White-fronted Lemur (Lemur albifrons). 



The vertebral formula is : 7 cervical, 13 lumbar, 3 sacral ; of the caudal 18 remain. Nine 

 pairs of ribs directly join the sternum, which consists of eight bones. 



Mus. Brookes. 



4639. The skull of the White-fronted Lemur (Lemur albifrons). 



The upper canines are unusually developed and recurved. 



Hunterian. 



4640. The skull of the Ring-tailed Lemur (Lemur Cattd). Mus. Brit. 



