34 HAPA LEMUR. 



when he wrote the i>ame(l Monograph in 1875 and 1876. 

 The first specimen (a skin with its skull) of H. simus 

 reached us in the month of September 1877. 



Now it is evident that in 1876 there being no specimen 

 of H. simus in our collection it may be called an impos- 

 sibility that Schlegel's figure of H. griseus published in 

 1868 could be that of H. simus. 



The figures in question therefore belong truly to Hapa- 

 lemur griseus ; but how could Gray and Beddard doubt of 

 the thing? I believe that I can give a satisfying answer. 

 The study of the figures learned me that two of them 

 are incorrectly drawn. I have before me a series of six- 

 teen slculls of H. griseus and not a single of the most 

 adult ones is by no means as broad as in the figure 4 a 

 (plate 7 of the Faune de Madagascar). Indeed in looking 

 at that figure it makes the impression as if it has been 

 taken after a skull of H. simus. But a closer inspection 

 shows that it has been misdrawn and differs for the rest 

 widely from that of B. simus. Generally a skull attains 

 its length at a relatively early period and afterwards be- 

 comes broader ; for instance the skull of a specimen of H. 

 griseus from East Madagascar collected by J. Audebert has 

 the same length as Schlegel's figure 4 a and as all our 

 fuUgrown skulls, viz.: 61m.m. , notwithstanding the hind- 

 most molar of upper and lower jaws are not yet developed : 

 and in this young specimen the width of the skull measu- 

 res 39 m.m. , meanwhile the width of the skull of the 

 fullgrown individuals measure 42 m.m. (not 45.5 m.m. as 

 in figure 4 a of the Faune de Madagascar). The skull of 

 our Hapalemur simus presents the following dimensions: 



Length of skull 79 m.m. 



Width of ditto 59 » 



There is however another inaccuracy in one of the figu- 

 res in the Faune de Madagascar , viz. : fig. 4 c shows no 

 upper incisors. 



Our large series of skulls of different ages demonstrates 

 that the upper incisors always are present, even I can see 



3S"otes from the Leyden ÜMuseum, "Vol. VII. 



