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Besides, there are the products of the interstitial cells, the creations of a special layer of cells around the ovum, the membrana granulosa. They produce a substance tonic to the uterus. When the ovaries are removed, there occurs an atrophy of the womb muscle, due to loss of this tonic substance.
Physa columnaris, Desh. Melanopsis buccinoidea, Ferr.; recent. The univalve shells most characteristic of fresh-water deposits are, Planorbis, Limnaea, and Paludina. Neritina globulus, Def. Nerita granulosa, Desh.
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