Reference for Niddah 52:44

המפלת דמות עורב ושליא מהו

— You, the other replied, have asked a question about that which does not exist. He raised an objection against him: If a woman aborted something in the shape of a beast, a wild animal or a bird, and a placenta with them, whenever the placenta is attached to it there is no need to take into consideration the possibility of the existence of a second embryo, but if no placenta is attached to it the possibility of the existence of a second embryo<span class="x" onmousemove="('comment',' That may have been crushed within the placenta. ');">⁴¹</span>

Jastrow

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