A bicornuate uterus.    From Wordnet, Princeton University. 

As for unusual animals, last week I treated a cow that had a bicornuate uterus.    From Wordnik.com.  [The Angel Experiment]

So, too, at the second or third month the uterus of the human embryo is bicornuate, and afterwards passes through stages comparable to the adult and permanent uterus of rodents, ruminants, and carnivores.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference

The instances of reversion here discussed are microcephalism, which Darwin wrongly interpreted as atavistic, supernumerary mammae, supernumerary digits, bicornuate uterus, the development of abnormal muscles, and so on.    From Wordnik.com.  [Evolution in Modern Thought] Reference

"opening the mouth," possibly connected with (b) (a bicornuate uterus), according to Griffith ( "Hieroglyphics," p. 60).    From Wordnik.com.  [The Evolution of the Dragon] Reference

(b) (a bicornuate uterus), according to Griffith.    From Wordnik.com.  [The Evolution of the Dragon] Reference