230 Mr. Home's Observations on the 
unimpregnated state, the two lateral canals would appear to 
be the proper vaginae, particularly as they begin at the meatus 
urinarius, which is commonly placed at the entrance of the 
proper, or true vagina, and receive the penis in coition, the 
end of which is pointed to fit it for that purpose ; in some spe- 
cies of the opossum the male has a double glans, each of 
them pointed, and diverging from the other, so as to enter 
both canals. But when we find these canals in the impreg- 
nated state forming with the uterus one general reservoir of 
nourishment for the foetus, and all communication during that 
period between them and the vagina cut off, we are led to 
consider them more immediately as appendages to the uterus 
than the vagina. 
The female kanguroo has two mammae, and each of them 
has two nipples ; they are not placed upon the abdominal 
muscles as in most quadrupeds, but are situated between two 
moveable bones connected with the os pubis, peculiar to this 
tribe of animals ; and the mammae are supported upon a pair 
of muscles which arise from these bones, and unite in the 
middle between them. The mammae are covered anteriorly 
by the lining of the false belly, and the nipples project into 
that cavity ; this covering is similar to the external skin, hav- 
ing a cuticle, and short hair thinly scattered over its surface, 
except at the root of the nipples, where there are tufts of 
some length, one at the basis of each. 
The mammas are supplied with blood from the epigastric 
arteries. The mammary branches run superficially under the 
false belly till they reach the mammas. There is a strong 
muscle that comes down from the upper part of the abdominal 
