3
The sanguinea are not all alike as regards testes and uterus. Taking
the former first, we find that some of them have not testes at all, as
the classes of fish and of serpents, but only two spermatic ducts.
Others have testes indeed, but internally by the loin in the region of
the kidneys, and from each of these a duct, as in the case of those
animals which have no testes at all, these ducts unite also as with
those animals; this applies (among animals breathing air and having a
lung) to all birds and oviparous quadrupeds. For all these have their
testes internal near the loin, and two ducts from these in the same
way as serpents; I mean the lizards and tortoises and all the scaly
reptiles. But all the vivipara have their testes in front; some of
them inside at the end of the abdomen, as the dolphin, not with
ducts but with a penis projecting externally from them; others
outside, either pendent as in man or towards the fundament as in
swine. They have been discriminated more accurately in the Enquiries
about Animals.
The uterus is always double, just as the testes are always two in
the male. It is situated either near the pudendum (as in women, and
all those animals which bring forth alive not only externally but also
internally, and all fish that lay eggs externally) or up towards
the hypozoma (as in all birds and in viviparous fishes). The
uterus is also double in the crustacea and the cephalopoda, for the
membranes which include their so-called eggs are of the nature of a
uterus.
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