116 ON THE UAKARI MONKEYS. 



me of the liver of P. satanas, the caudate lobe is triangular and forked 



instead of square, and the left lateral lobe is proportionally smaller 



P. Z. S. 1880, than in Brachyurus ; this develops moreover a very marked, subtri- 



p. bd7. angular, inwardly directed process at its antero-internal angle, which is 



not seen in the other genus. 



The pancreas is fairly compact, and is, at its greatest extent, 3 inches 

 long ; its duct opens, with that of the bile-duct, \ inch from the 

 pylorus. About J an inch from the common aperture of these in the 

 duodenum is a smaller opening, apparently that of a secondary pan- 

 creatic duct. 



The spleen is elongated and flattened, and attached to the left of the 

 greater curvature of the stomach ; it is of a red colour, and 2 J inches 

 long. 



The great vessels are given off as in Man and the other Primates. 

 The external and internal iliacs are given off from a common trunk ; the 

 caudal artery is small. 



The lungs have two lobes on the left and three on the right side *, 

 638 besides an azygos lobe, which lies behind the heart in a transverse 

 direction, and is triangular in shape. The left lower lobe is the largest, 

 the right lower the next. 



The cricoid cartilage is deeply notched above. The vocal cords are 

 well developed, *35 of an inch long ; the ventricles have the shape of 

 watch-pockets, extending downwards and inwards. There are no laryn- 

 geal pouches. The epiglottis is notched above. There are about 27 

 tracheal rings. 



The kidneys are smooth and rather elongated in shape; the supra- 

 renal bodies are well developed and oval. The ureters open '75 inch 

 from the neck of the bladder. 



The ovaries measure *45 inch, the Fallopian tubes 1 inch. The 

 uterus is single and smooth within ; it is '75 inch long. The vagina is 

 double that length ; and the clitoris is small and flattened. 



As regards the osteology, already briefly described by Gervais (" Ee- 

 marques oste'ologiques sur les genres Brachyure et Callitriche ") in 

 Castelnau's 'Expedition dans 1'Amerique duSud' [Paris, 1855, Ana- 

 tomic, pp. 93-99], there is not much of interest to add. 



The vertebral formula of my specimen of Brachyurus is C. 7, D. 13, 

 L. 6, S. 4, C. 15 or 16t. 



Gervais gives C. 7, D. 14, L. 6, S. 4, C. 17 for B. rubicundus -, the 



* In a 5 Pithecia satanas the right lobe was only two-lobed, the extra superior lobe 

 being only indicated and not cut off. 



t In my specimen the few minute terminal caudal vertebrae have unfortunately 

 been laid aside, and cannot now be found. There were not, however, more than 

 three or four of them, which, added to tbe twelve that remain, give the above 

 numbers. 



