Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 904
of the nacreous surface may perhapsbe thus accounted for. A similar arrangement is found in pearls^which are rounded concretions projecting from the inner surface ofthe shell of Meleagrina, and possessing a nacreous structure corre-sponding to that of mother-of-pearl. Such concretions are found… … Fig. 039.—Section of nacreous lining of shell of Meleagfinam a rga ritifera (Pearl-oyster). even entirely made up of the prismatic substance of the externallayer, and may be consequently altogether destitute of the pearlycharacter. In all the genera of the Margaritacece we find the external layerof…
Microscopy
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