. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . v. u Fig. 75. Navicula (§ Pinnularia) major Kiitz. 1, individual cell immersed in Indian ink; 2 and3, valve and girdle views respectively, showing the narrow threads to which are attached theparticles of ink. (From Oltmanns, after Lauterborn.) A band-like thread of much larger size has been described and figuredby Schroder (02) as being formed by Amphipleura pellucida. This is asluggish diatom with scarcely appreciable changes of position, an
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . v. u Fig. 75. Navicula (§ Pinnularia) major Kiitz. 1, individual cell immersed in Indian ink; 2 and3, valve and girdle views respectively, showing the narrow threads to which are attached theparticles of ink. (From Oltmanns, after Lauterborn.) A band-like thread of much larger size has been described and figuredby Schroder (02) as being formed by Amphipleura pellucida. This is asluggish diatom with scarcely appreciable changes of position, and thesecretion of such a mucous band might be sufficient to account for the feeblemovements which occur. The movements of diatoms are not all of a uniform character, and it is 104 Bacillariese quite conceivable that they may not all be due to the same cause. Theslow rolling and turning movements exhibited by some forms are verydifferent from the rapid forward and backward propulsion so conspicuouslyshown by others. Those diatoms with the highest development of the rapheshow the quickest movements, generally a jerky propulsion which enablesthem to mo
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