Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 402
imilar union of the transversely-striated indi-vidual frustules; but these are narrower at one end than at theother, so as to have a cuneate or wedge-like form ; and areregularly disposed with their corresponding extremities alwayspointing in the same direction, so that the filament is… … Fig. 170.—Meridion circulars FlG. 171.—Bacillaria pavadoxa. it really grows in a helical (screw-like) form, making several con-tinuous turns. This Diatom abounds in many localities in this 342 MICROSCOPIC FOEMS OF VEGETABLE LIFE. Fig. 172. country; but there is none in which it presents itself in…
Microscopy · Biology
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