Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 656
ceding, highly magnified to show theminute structure of the shell:—a, a, portions of the ordinaryshell-substance traversed by parallel tubuli; 6, 6, portionsforming the marginal cord, traversed by diverging and largertubuli; c, one of the chambers laid open ; d, d, rf, pillars ofsolid substance not… … from communication with the exterior, but that they may haveretained their vitality to the last. The shell itself is almost every-where minutely porous, being penetrated by parallel tubuli whichpass directly from one surface to the other. These tubes areshown, as divided lengthways by a vertical…
Microscopy · Biology
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