394 MR. F. E. BEDDARD ON HAPAI.EMUR GRISEUS. [June 3, 



Museum at South Kensington contains skins of Hapalemur griseus, 

 all of which with one exception (a very small, probably immature 

 specimen) show the character that has just been described. In 

 these specimens, however, there are no means of ascertaining the 

 sex, and accordingly it is not possible to be quite certain whether 

 this patch of spines is common to both sexes, or is a secondary sexual 

 character confined to the males, though on the whole the evidence 

 seems to point to the conclusion that it is not peculiar to the males. 



So far as I am aware this structural character has not been 

 hitherto described in this or any other Lemur, and it seems to be con- 

 fined to this one species. I have examined the single specimen of 

 Hapalemur simus in the Natural-History Museum, and it shows no 

 traces whatever of any such structure, nor can I find any thing like 

 it in other Lemurs. 



When the skin covering the arm was removed, an oval gland about 

 the size and shape of an almond was seen to correspond to this 

 patch of spines ; but I could not ascertain whether there was any 

 direct relation between them, since the duct, if any such existed, was 

 destroyed by removing the skin. The gland was equally well 

 developed upon both arms. 



Although the specimen to which the present description relates 

 is a male, well-developed mammary glands were found to exist. The 

 apertures of these glands are upon the arm ; and on removing the 

 skin the glands themselves were found to be attached by membrane 

 to the pectoralis major, the biceps, and part of the deltoid muscles. 

 The position therefore, as well as the actual occurrence of these 

 mammary glands, appears to be abnormal. 



The palate is traversed by eight transverse ridges, of which the 

 five anterior and the last are complete and pass from side to side 

 without any break : the two middle ridges are interrupted in the 

 median line. The shape of these palatal ridges, which increase in 

 breadth progressively from before backwards, is like that of the figure 

 3 : each half of the ridge is semicircular with the convexity directed 

 forwards ; in the middle of the palate the two semicircles meet at an 

 angle which becomes more acute in the posterior ridges ; in the 

 anterior two ridges this angle is hardly at all marked, and the 

 whole ridge forms a single continuous semicircle with the convexity 

 directed forwards. The same may be said of the terminal ridge. 



Each ridge passes from a given point on one side of the mouth to 

 the corresponding point on the other: the first connects the bases of 

 the two canines, the second passes from the interval between the two 

 anterior premolars to the same point on the opposite side of the mouth. 

 The third and fourth similarly connect the intervals between the suc- 

 ceeding premolars and molars with those of the opposite side ; but the 

 fifth ridge in the specimen examined by me is irregular, arising on the 

 right side from the interval between the last premolar and first molar 

 close to the ridge in front, but terminating on the left side in the 

 interval between the first and the succeeding molar tcoth, close to 

 the ridge behind. The sixth and seventh ridges connect the intervals 

 between the last molars of one side with the other ; and the eighth 



