168 PROCEEDINGS OF TflE ACADEMY OF [1880. 



short one, the latter dividing into left carotid and subclavian. 

 The arteries and veins of the extremities did not differ from those 

 of the Gorilla and Chimpanzee. I found in the Orang, as in them, 

 the " long saphenous artery " accompanying the nerve and vein 

 of same name. The mesenteric vessels exhibited loops along the 

 borders of intestine. 



Genito-urinarij Apparatus. — The general appearance of these 

 structures resembled strikingly those of man (PL 15). The 

 kidne}'- measured 1^ inches in length, and exhibits only one 

 papilla. The ureters were 5 inches long. The bladder was 2 

 inches in length and 1 in diameter. The testicles measured | of 

 an inch in length, and were situated near the inguinal canal. The 

 cavity of the tunica vaginalis testes was shut off from the general 

 peritoneal cavity. The vas deferens was 4 inches in length, the 

 seminal vesicle 1 inch ; the seminal duct was yery short. The 

 caput gallinaginis was well developed, as was also the prostate. 

 The penis measured 2 inches in length, the glans was of cylindri- 

 cal shape. There was no bone in the penis. The Cowper's glands 

 were relatively large. 



Nervous System — The brain of the Orang has been figured by 

 Tiedemann, Sandifort, Schroeder van der Kolk and Yrolik, Gra- 

 tiolet, Kolleston, etc. On account, however, of the few illustrations 

 extant, and of the importance of the subject, I avail myself of the 

 opportunity of presenting several views of my Orang's brain (Pi's 

 16 and 11), which was removed from the skull only a few hours after 

 death. The membranes were in a high state of congestion, and a 

 little of the surface of the left hemisphere had been disorganized 

 by disease, otherwise the brain w^as in good condition. It weighed 

 exactly 10 ounces. The brain of tlie Orang in its oeneral contour 

 resembled that of man more than those of either of the Chimpan- 

 zees which I examined. In these the brain was more elonaated. 

 The general character of the folds and fissures in the brain of the 

 Orang, Chimpanzee, and man are the same, there are certain 

 minor differences, however, in their disposition in all three. The 

 fissure of Silvius in the Orang runs up and down the posterior 

 branch pursuing only a slightly backward direction, the anterior 

 branch is small. The fissure of Rolando, or central fissure, quite 

 apparent, is, however, situated slightly more forward in the Orang 

 than in man. It differentiates the frontal from the parietal lobe. 

 The parieto- occipital fissure is well marked, bordered externally 



