332 PROF. HUXLEY ON ARCTOCEBUS CALABARENSIS. [June 28, 
In the brachial cord there was a precisely similar arrangement ; but 
the small branches were rather more numerous. 
I am not aware that any rete mirabile has yet been observed having 
the arrangement just described ; and it would be a matter of much 
interest to work out the details of the angeiology of this animal in a 
specimen better fitted for investigation. 
Fig. 11. 
The uropoietic and male reproductive organs of the Angwantibo (nat. size). 4, 
anus; R, rectum; K, kidney; SR, suprarenal bodies; Ur, ureter; Bl, blad- 
der; Hy, hypogastric artery; 7, testis; V.d, vas deferens; Pr, prostate ; 
Cp, Cowper’s glands ; CC, corpora cavernosa. 
The kidneys (fig. 11, K) are situated in the lumbar region, imme- 
diately below the diaphragm, the right being higher than the left by 
half its length. Each kidney is 0°7 in. long by 0°35 inch wide, and is 
shaped much like that of Man. In vertical and longitudinal section 
