POLYVITELLINY IN POND SNAILS

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Abstract
That polyvitelline eggs do not contain true twins is shown by the following facts:1. The vitelli are normally enveloped by the albumen and egg membrane before any of them have undergone the first maturation division (Figs. 2, 6).2. The vitelli often occur in uneven numbers (Plate I, Tables I., II.).3. Motile embryos show no evidence of attachment to each other.4. Each of the 116 young was a normal dextral individual, except for size, when hatched.

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