928 MR. F. E. BEUDARD ON THE ANATOMY [DeC. 14, 



7. Notes upon the Anatomy o£ Monkeys of the Genus 

 Fithecia. By Frank E. Beddard, M.A., F.R.S., 

 F.Z.S., Prosector to the Society. 



[Receiver! October 26, 1909.J 

 (Text-figures 286-294.) 



( 1 ) Fithecia pithecia. 



A young male example of this monkey lived only for a short 

 time in the menagerie and came into my hands on September 3. 

 Inasmuch as our knowledge of the A'iscera of this genus is not 

 extensive, I took a number of notes upon certain organs which 

 were best studied in the fresh condition, and preserved for future 

 reference the remaining viscera. The present communication to 

 the Society is the result of the examination of these viscera, from 

 which I am able to compile some account of the principal organs 

 of the body. 



So far as I am aware, there is but one paper dealing with the 

 general anatomy of the genus Pithecia, and that is by the late 

 Sir W. H. Flower (5). There are, however, notes ujoon other 

 species scattered through various publications dealing with the 

 New World Primates of which the accompanying bibliography 

 (see p. 943) includes those that I have consulted, as well as others 

 dealing with allied forms of Platyrrhines. 



§ Brain. 



The brain was carefully extracted (after noting the arrange- 

 ment of the sulci in the fresh brain) and preserved in alcohol. 

 The total length of the hemispheres is 48 mm. ; the greatest 

 breadth of the cerebrum is 38 mm. The cerebellum is com- 

 pletely hidden when the brain is viewed from above. 



In its general features the brain of Fithecia pithecia very 

 closely resembles, as might be expected, that of Pithecia ononachus, 

 figured by the late Sir W. H. Flower (5, p. 329, figs. 1, 2, 3), one 

 of which figures (fig. 1) is practically identical with Dr. Elliot 

 Smith's representation (11, p. 415, fig. 61) of Pithecia, where the 

 brain is drawn from the dorsal aspect. Dr. Elliot Smith does not 

 mention the species referred to, at any rate in the legend beneath 

 the figure. It might, in my opinion, have been copied either 

 from Flower's figure or fi'om the actual brain from which that 

 figure was drawn. Another brain of this species is figui-ed from 

 the lateral aspect by Dr. Elliot Smith in the " Catalogue of the 

 Boyal College of Surgeons " (12, p. 392, fig. 230), in which work 

 there is also some description of the brains of P. satanas and 

 P. alhinasa. Concerning the first of these two species, Mr. Forbes 

 has made some observations (3 a). All of these three species 

 of Pithecia have been dealt with by Drs, Kiikenthal and Ziehen, 



