of the Ornithorhynchus Hystrix. 3(33 
membrane of the stomach, situated at the termination of the 
pylorus in the duodenum. 
Plate XII. 
Fig. 1. The penis and testicles in their relative situation, to 
show the urethra for the passage of the urine, and that for the 
semen. 
aa. The glans penis divided into four projecting processes, 
which in the relaxed state are concave; the orifice is in the 
centre of each of the projections. 
b. The body of the penis. 
cc. The rectum laid open. 
dd. The orifices of the glands of the rectum. 
ee. The two glands which correspond to Cowper’s glands, 
their excretory ducts opening into the urethra of the penis. 
f. The termination of the urinary urethra in the rectum. 
g. The urethra laid open through its whole course. 
b. The opening leading to the urethra for the semen. 
i. The orifice of the neck of the bladder. 
k. The urinary bladder. 
II. The openings of the vasa deferentia into the urethra. 
mm. The bodies of the testicles. 
nn. The epididymis of the testicles. 
Fig. 2. The penis of the drake, in its extended state. 
a a. The verge of the fundament surrounded by the feathers. 
bb. The urethra laid open through its whole extent. 
cc. The orifices of the vasa deferentia. 
dd. The prepuce of the penis laid open, and, from its elasti- 
city, thrown into serpentine folds. 
