Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 906
sing from the margin or lip (atthe left hand of the figure) towards the hinge (which would be atsome distance beyond the right). This section brings into view thetwo substances of which the shell is composed, traversing the outeror prismatic layer in the direction of the length of its prisms,… … Fig. 641.—Vertical section of the lip of one of the valves of theshell of Unio: a, b, c, successive formations of the outerprismatic layer; a, b, c, the same of the inner nacreous layer. layer, and it may be easily shown by tracing them, towards thehinge on the one side and towards the margin on…
Microscopy
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