MONOTREMATA. 393 
seminal urethra. The physiological relation of | The female organs of generation (fig. 191) 
these glands to such a canal is clearly illus- consist of two ovaria, the right much smaller 
trated by their presence in the Monotremes, than the left, two oviducts, two uteri, a clitoris, 
and their absence in the oviparous animals and mammary glands. 
which have merely a seminal groove. 
bat eee 
- = - * 
a, Cloacal outlet. 
. 6b, Common vestibule. 
*" c, Uro-genital canal. 
Ff, Left ovary. 
J’, Right ovary. 
i, Ovarian ligament. 
ce’, Its sphincter. k, Urinary bladder. 
d, Uterus. 1, Ureter. 
d’, Oviduct. m, Os uteri. 
e, Ovarian aperture. 
my Female organs of generation, natural size, Ornithorhynchus. (Owen, Philos. Trans. 1832. ) 
