of the Ornithorhynchus paradoxus, 83 
situation, to show the uncommon shape of the scapulae, which 
are not connected with the chest, but with a bone placed above 
the sternum, the upper part of which answers the purpose of 
clavicles ; the anterior part of each scapula passes under this 
bone laterally, forming with it a bony case for this part of the 
neck. 
Another peculiarity is, the cartilages of the ribs not being 
placed next the sternum, but between two portions of the rib. 
The false ribs have their cartilages terminated by thin bony 
scales, which slide on one another in the motions of the chest. 
The pelvis is unusually small, and has the two moveable 
bones, attached to the os pubis, which are met with in the 
kangaroo. 
a a a. The bone which corresponds to the clavicles in other 
animals. 
hhh. The left scapula. 
ccc. The bony scales along the margin of the chest 
ddd. The cartilages of the true ribs. 
ee. The moveable bones of the pelvis. 
Plate IV. 
Fig. 1. Represents the penis in a relaxed state, but drawn 
out to its full extent, with its relative situation to the rectum 
and testicles, which are contained in the cavity of the abdomen. 
a a. The bodies of the testicles. 
bb. The epididymis. 
c. The urinary bladder. 
dd. The rectum. 
ee . Two glands, whose ducts enter the rectum by a number 
of small orifices. 
M 2 
