Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 811
Fig. 569.—Cycloclypeus—external surface and vertical and horizontal sections. which fills up with a solid boss what would otherwise be the de-pression at the umbilicus of the spire. The substance of this bossJis traversed by a set of straight canals, which pass directly from thespiral canal… … Fig. 570.—OpercuUna laid open to show its internal structure : a, marginalcord seen in cross-section at a; b, b, external walls of the chambers;c, c, cavities of the chambers; c c, their alar prolongations; d, d, septadivided at dd and at d so as to lay open the interseptal canals, thegeneral…
Microscopy
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