Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 634
that if the growing animal be kept infresh water aloiie for some time, without vegetable matter ofany kind, the gastric teeth are very imperfectly developed, andthe ciHa are still retained.* 851. A very curious modification of the ordinary plan ofdevelopment, is presented in the Purpura lapilhis;… … #>^ tains from 500 to 600 Fig. egg-like bodies (Pig.271, a), imbedded in aviscid gelatinous sub-stance ; but only from12 to 30 embryoesusually attain com-plete development;and it is obvious fromthe large comparativesize which these attain(Pig. 272, b), thateach of them mustinclude an amount…
Microscopy
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