120 MR. F. E. BEDDARD ON BRACHYURUS CALVUS. [Feb. 1, 



the colour gradually assumes a fulvous-brown tint, the brown being 

 darker in the pectoral region, where the brown hairs are very 

 numerous, only a few white hairs being interspersed among them. 

 The brownish tinge is also conspicuous on the arms, legs, and tail, 

 particularly on the tail, on the posterior aspect of the thighs, and at 

 the wrist and ankle. The top of the head is a greyish colour, 

 gradually passing into brown anteriorly and at the sides, as in 

 S, rubkmidus ; tlie hairs on the throat also resemble that species in 

 their dark brown colour, and in being mixed with numerous black 

 hairs ; the general tint of the hair on the throat is a rich chestnut- 

 brown, and is exactly similar to that of B. rubicundus. 



With regard to the osteology, I tind that the number of vertebrae 

 in my specimen is C. 7, D. 13, L. 6, S. A, Cd. 15, of which the 

 last three are very minute and ajiparently ankylosed together. 

 Forbes states in his paper that in B. melanocephalus there are 19 or 

 20 caudal vertebrse, on the authority of a specimen belonging to 

 that species in the National Collection. The specimen in question 

 (806 h) has certainly the 20 caudal vertebrse that Forbes has men- 

 tioned ; but it does not present any recognizable differences from 

 Brachyurus calvus, and indeed is entered in the Catalogue as belonging 

 to that species. 



It is not necessary to give much account of the visceral anatomy 

 of this species, inasmuch as I have been unable to find any marked 

 points of difference from B. rubicundus ; the alimentary viscera pre- 

 sented a very close correspondence in the two species, as will be 

 evident from the following notes. 



The tongue resembles in every particular that of B. rubicundus, 

 and, curiously enough, even the arrangement of the circumvallate 

 papillae corresponds in the two species. The correspondence is curious, 

 because Mr. Forbes's description of the circumvallate papillae reads 

 almost as if he were referring to an abnornal condition. The circum- 

 vallate papillae in the two species are disposed in the usual V-shape, 

 but there is an additional papilla on the right side between the apical 

 and basal papillae, thus destroying the symmetry of the arrangement. 

 In a specimen of Macacus rhesus, to which I am able to refer at the 

 moment of writing, there are also four circumvallate papillae ; two are 

 situated side by side, and symmetrically at the apex of the V, v\hile 

 the two others occupy the usual position. 



Ccecum. — The caecum measured 10 inches along the greater cur- 

 vature ; it is separated from the colon by a very marked constriction; 

 it is not sacculated, and when fully distended with air was curved 

 ou itself into a little less tlian a circle ; it is furnished with a well- 

 developed median frenum which carries blood-vessels. 



In examples of two species of Callithrix and in a Pithecia I have 

 noted an identical structure in the caecum. 



The origin of this peritoneal fold is not exactly in the middle line 

 at the lower extremity of the ileum, and the blood-vessel passes on to 

 it over one side of the base of the ileum ; the blood-vessel in fact 

 exactly corresponds to that which is borne by one of the lateral folds 

 in Hapale. 



