Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 726
frame-work. 545. The first indication of the production of the young Echinusfrom its pluteus, is given by the formation of a circular disk(Fig. 377, a, r), on one side of the central stomach (b); and this PLUTEUS-LARVA OF ECHINIDA. 645 disk soon presents five prominent tubercles (b), which…
Microscopy · Biology
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