Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 633
o a sortof fin-like membrane on either side, the edges of which arefringed with long cilia (Fig. 270), whose movements may beclearly distinguished whilst the embryo is still shut-np withinthe egg; at a very early period may also be discerned the auditory vesicles or rudimentary organs of hearing (§… … Embryoes of NtidihrancMate Gasteropods. to be evolved into the foot or muscular disk of the animal.While these organs are making their appearance, the shell isbeing formed on the sui^face of the posterior portion, appearingfirst as a thui covering over its hinder part, and graduallyextending itself…
Microscopy
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