. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 43. Gonyaulax spinifera (Clap. & Lach.) Diesing, to show the plates of the , dorsal view; B, ventral view; C, antapical view; D, apical view; 1—6, girdle series ofplates; 1—3, apical series; 1—6, precingular series; 1—6, postcingular series;V, posterior intercalary; I, autapical plate; ant. pi., anterior plate of ventral area;ant. sp., antapical spine; cl. pi., closing plate of apex ; , fission line along which the wallpar
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 43. Gonyaulax spinifera (Clap. & Lach.) Diesing, to show the plates of the , dorsal view; B, ventral view; C, antapical view; D, apical view; 1—6, girdle series ofplates; 1—3, apical series; 1—6, precingular series; 1—6, postcingular series;V, posterior intercalary; I, autapical plate; ant. pi., anterior plate of ventral area;ant. sp., antapical spine; cl. pi., closing plate of apex ; , fission line along which the wallparts in cell-division; fl. po., flagellar pore; int. pi., intermediate plates (usually four innumber, hidden iu constricted region of ventral area); post, pi., posterior plate of ventralarea; , ventral area ( — longitudinal furrow); v. po., ventral pore. x 1000 (after Kofoid). than the equator should be used as a basis, since the plates are invariablyarranged with reference to the girdle, which is not necessarily equatorial inposition. The girdle (or cingulum) separates the epivalve from the hypovalve,and in all the genera except G
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambridgeengtheuni
