174 
OSSEOUS SYSTEM, &C. 
c. Two processes from this bone, by means of which 
it is united to the scapulae. 
d, d, The scapulas, which, united to the flat bones, 
form the glenoidal cavities of the shoulder-joints. 
e, A slender curved bone, crossing the upper end 
of the sternum, and uniting the scapulae to each 
other. 
Os humeri. 
4. Engraved from a pencil sketch, by Mr R. M'Inke s, 
of the organs of generation in the male Ornitho- 
rynchus, 
«, The testicles. 
5, The epididymis. 
c, The bladder of urine. 
d. The orifices of the seminal vessels {vasa deferentia) 
entering the urethra close to the opening into the 
bladder. 
^, The urethra laid open. 
The rectum ; partly laid open at g. 
The common surface of the cloaca slit up. 
iy The opening by which the seminal fluid passes 
into the canal peculiar to the penis. This open- 
ing leads into a small cavity, into which enter the 
ducts from Cowper's glands, marked Z;, and from 
which arises the canal of the penis, admitting the 
seminal fluid, and that from Cowper"*s glands only. 
Z, The orifices of a number of small blackish mucous 
glands, which pour their fluids into the cloaca, 
close to the entrance of the rectum. 
My The body of the penis. 
w, Marks the four small conical papillae in which each 
glans terminates: these papillae are hollow and 
pervious. 
