1884.] MR. F. E. BEDDARD ON HAl'ALEMUR GRISEUS. 3!)5 



ridge, which bounds the posterior margin of the hard palate, arises a 

 short way behind tbe last molar. The hard palate is distinguishable 

 from the soft palate by its greenish colour. 



The tongue is covered on its posterior half with a closely-set mass 

 of large, conical, backwardly-directed papillae ; the anterior half is also 

 covered with small papillae, but looks almost smooth by comparison ; 

 the free tip of the tongue is slightly frayed out in a brush-like 

 fashion. The sublingua, so characteristic of the Order, is well 

 developed in Hapalemur, and furnished on the under surface with 

 three folds, of which the median one is the strongest. 



Beneath the sublingua is a bifid projection of the mucous membrane 

 of the mouth, which is so largely developed that it has quite the 

 appearance of a third tongue. This structure, which is also to be seen 

 in Perodicticus and Arctocebus, appears to be the projecting termina- 

 tion of the ducts of the submaxillary glands. 



The stomach is about 2 inches long, the greater portion by far 

 belonging to the cardiac division of the organ ; the entrance of the 

 oesophagus is close to the exit of the duodenum. At the pylorus 

 there is a complete circular valve, which separates the stomach from 

 the duodenum, and which is considerably broader and thicker above 

 than below. The mucous membrane lining the cavity of the stomach 

 is raised into a few irregular longitudinal ridges. 



The small intestine measures 2 feet 4 inches in length, while the 

 large intestine is only 1 foot in length. The Peyer's patches, which 

 in man are confined to the ileum, extend into the caecum of Hapa- 

 lemur and nearly as far as the termination of the colon. In the caecum 

 are two circular Peyer's patches, situated one in front of the other 

 about the middle of its length, besides a number of "solitary "follicles. 

 In thecolon I counted 10 "agminated" follicles, the first placedatabout 

 an inch from the ileo-csecal valve ; there were also a great number 

 of solitary follicles. In the small intestine there is a large Peyer's 

 patch, about 1 inch from the ileo-csecal aperture, and another nearly 

 2 inches behind this ; further back still there were two others. The 

 Peyer's patches of the small intestine are covered with villi. 



So far as I am aware this is the first recorded description of Peyer's 

 patches in the large intestine of any Lemuroid 1 . 



The large intestine is slightly wider than the small intestine ; its 

 outer surface, like that of the caecum, is perfectly smooth and devoid 

 of sacculations. 



The ccecum is very simple ; it is an oval sac hardly perceptibly 

 narrower at its blind extremity ; the surface is quite smooth, without 

 any sacculations. The entrance of the ileum is guarded by a circular 

 valve ; about an inch from tbe ileo-csecal aperture the caecum passes 

 gradually into the colon. The total length measured from the exit of 



1 Dr. G. E. Dobson, F.E.S., lias discovered and recorded tbe presence of 

 Peyer's patches in the rectum of Myogale and other species of Moles (Monogr. 

 Insectivora, Pt. ii. p. 172, pi. xxii. fig. 5) ; and the same author informs me that 

 he is about to publish in the next number of the ' Journal of Anatomy and 

 Physiology' a description of these structures in the caecum and colon of several 

 Insectivora and Eodentia. 



