OF THE ORNITHORHYNCHUS PARADOXUS. 
535 
Description of the Plates. 
Plate XV. 
Fig. 1. The organs of generation in the unexcited state, with the urinary 
bladder and rectum of a full-grown female Ornithorhynchus. 
a. The external outlet or orifice of the vestibule. 
b. The vestibule. 
c. The urethro-sexual canal. 
d, d . The uterine tubes or oviducts. 
e, e. Their anterior or Fallopian orifices. 
f. The ovary, developed only on the left side. 
g, g. The ovarian capsules or peritoneal bags connecting the ovarian liga- 
ments with the Fallopian extremities of the uterine tubes. 
h, h. The processes of peritoneum connecting the oviducts to the liga- 
ments i, i. 
h. The urinary bladder. 
1. The rectum. 
m. The clitoris. 
n. The sheath or preputium clitoridis. ri. Plate XVI. A bristle passed 
into the sheath through the orifice in the vestibule, 
o, o. Two small glands which open into the sheath of the clitoris. 
р. Outline of the pelvis, showing its relation to the urethro-sexual 
canal. 
Fig. 2. One of the mammary glands from the same individual, exhibiting 
the lowest observed degree of development. 
a. The gland, a ', a!. Sheaths of cellular membrane .which could be 
inflated, and had been occupied probably with the glandular 
lobules at a previous period of enlargement. 
h. The panniculus carnosus. 
с. The integument. 
Plate XVI. 
Fig. 1. The organs of generation of another adult female, which were pro- 
3 z 2 
