610 ON ARCTOCEBUS CALABARENSIS 
the ducts of two large oval sacs, which are perfectly distinct from 
one another, though their inner walls are united for some distance. 
The walls of these sacs are raised into oblique folds, and they lie at 
the back of the neck of the bladder behind the vasa deferentia, and 
occupy the place of the vesicula seminales. As they do not com- 
Fie. 1, 
The uropoietic and male reproductive organs of the Angwantibo (nat. size). 4, anus ; Rk, 
rectum ; A, kidney; SA, suprarenal bodies ; Ur, ureter ; 4/, bladder ; Hy, hypogastric 
artery ; 7, testis; 7’., vas deferens; Pr, prostate ; Cf, Cowper’s glands ; CC, corpora 
cavernosa, 
municate directly with the vasa deferentia, however, I am doubtful 
whether they ought to be considered as representing the vesicule 
seminales, or as a large uterus masculinus. 
These sacs are distinguished externally from the prostate (77) 
only by a slight constriction; but their ducts pass in front of that 
gland, which lies altogether at the back of the urethra, so that the 
front wall of the latter is free and uncovered by the prostate. The 
