The microscope and its revelations . Campylodisctis costatus :—A, front view; b, side view. by its ribbed markings, which seem to indicate the presence ofcanals excavated in or beneath the valves, for the passage offluid between the orifices in the siliceous envelope and the softcell-membrane beneath. The form of the valves, in most of thespecies, is circular, or nearly so; some are nearly flat, whilstin others the twist is greater than in the species here repre-sented. Some of the species are marine, whilst others occurin fresh water; a very beautiful form, the C. clypeus, exists insuch abund
The microscope and its revelations . Campylodisctis costatus :—A, front view; b, side view. by its ribbed markings, which seem to indicate the presence ofcanals excavated in or beneath the valves, for the passage offluid between the orifices in the siliceous envelope and the softcell-membrane beneath. The form of the valves, in most of thespecies, is circular, or nearly so; some are nearly flat, whilstin others the twist is greater than in the species here repre-sented. Some of the species are marine, whilst others occurin fresh water; a very beautiful form, the C. clypeus, exists insuch abundance ia the Infusorial stratum discovered by at Soos near Ezer in Bohemia, that the earth seems * See Mr. BrigMweUs excellent memoir On the genus Trieeratium, in Quart. Microse. Joum., vol. i. p. 245. DlATOilACE^ :—SUKIRELLA, NAVICULA. 321 almost entirely composed of it.—Some of the forms of the lastgenus lead towards Surirella (Fig. 88), which, like it, presents Fig.
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
