Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 905
of bivalve shells, however, there is notthe least approach to the nacreous aspect; nor is there anythingthat can be described as definite structure ; and the residuumleft after its decalcification is usually a structureless basementmembrane. The ordinary account of the mode of growth of the shells… … Fig. 640.—Section of hinge-tooth ofMya arena rid. SHELLS OF LAMELLIBRANCHS 849 the whole truth ; for it takes no account of the fact that most shellsare composed of two layers of very different texture, and does notspecify whether both these layers are thus formed by the entiresurface of the mantle…
Microscopy
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