Lemurs of the Hapalemur Group. 



349 



Teeth of H. schlegeli shorter and narrower. 



The typical skull of H. schlcgeli has fully eni])tecl and 

 complete dentition and the sutures nearly obliterated. The 

 obliteration, however, has not extended to quite the same 

 extent as in the skull referred to H. olivaceus. Nor is there 

 in the skull of H. scldegeli a median sagittal ridge on the 

 parietal region. The low temporal crests are merely con- 

 fliient near the middle of the parietals. The difference in this 

 respect may be due to difference of age ; but this is uncertain. 

 When the two skulls are placed side by side on a flat surface 

 they are practically the same height, despite the considerable 

 disparity in length. 



The differences in the shape and the dimensions of various 

 parts of the skulls may be appreciated from the subjoined 

 table of measurements of the type of sc/ile(/eU and of my skull 

 referred to olivaceus. In the third coluuin are given the 

 dimensions taken from the figures of the skull named grUeus 

 by M. -Edwards : — 



Skulls assigned to H. griseus liave also been figured by 

 Jentink (Notes Leyden Mus. vii. pis. i. & ii. figs. 3-4, 1885) 

 and by van der Hoeven (Tijds. Nat. Geschied. 1844, pi. i. 

 fig. 1) ; but in both cases there are discrepancies in the 

 dimensions of the superior and lateral views which make it 

 impossible to tabulate the measurements. For instance, in 

 the case of Jentink's specimen the superior view of the skull is 

 65 mm., the lateral view 62*5, whereas the lateral view of the 

 mandible from the condjde is 44 and the superior view 40. 



