Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 422
acommon descent, and which must therefore be accounted as ofthe same species; and thus to obtain an idea of the range ofvariation prevailing in this group, without a knowledge of which.specific definition is altogether unsafe. Of the very stronglymarked varieties which may occur within the limits… … Fig. 189. Mastogloia Smithii:—A, entire stipes; B, frustule in itsgelatinous envelope ; c—P, different forms of frustule as seen in sideview; g, front view ; h, frustule undergoing subdivision. Fig. 190. Mastogloia lanceolaia. • specific type, did they not occur upon the same stipes. The care-ful…
Microscopy · Biology
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