1887.] MR. SUTTON ON THE ARM-GLANDS OF THE LEMURS. 



369 



2. On the Arm-glands of the Lemurs. 

 By J. Bland Sutton, F.R.C.S. 



[Received February 25, 1887.] 



In 1884 Mr. Beddard made a communication to this Society, "On 

 some Points in the Structure of Hapalemur r/riseiis" '. In this paper 

 attention was drawn to a very singular patcli of spines on the flexor 

 aspect of the forearm, represented in the accornpaning drawing 



(H- I)- 



Fig. 1. 



The forearm of Hapakmur griscus, sliowing the patch of spine-like processes 



and the tuft of hairs. 



[n a postscript to his paper jNIr. Beddard was able to state that this 

 collection of spines was not a sexual character, but exists in both 

 sexes of Hapalemur griseus, while it is unrepresented in Hapalemur 

 stniiis. Mr. Beddard applied for information to Dr. Jentink and to 

 Prof. A. Milne-Edwards. These gentlemen very kindly examined 

 the large series of examples of the two species preserved in the 

 Museums of Leyden and Paris, and found that Hapalemur griseus 

 is distinguished from H. simus by a patch of spines upon the arms, 

 which, however, shows certain differences in the two sexes. In the 

 females the spines are replaced by hairs, but the patch as a whole 

 is quite distinct from the rest of the integument of the arm. Dr. 

 Jentink furthermore directed his attention to a possibly similar 

 structure (a climbing-organ ?) upon the arm of Lemur catta, which 

 has the firm of a liorny outgrowth somewhat like the spur of a 

 cock. At the time Mr. Beddard was engaged in dissecting Hapa- 

 lemur he kindly afforded me every opportunity for examining this 

 curious structure on its forearm. This part in question Mr. Beddard 

 describes thus : — - 



' See P. Z. S. 1884, p. 391. 



