Translation 2816
Translation 2816
Translation 2816
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55<br />
3. Antapical horn points inwards, is relatively short, and<br />
occasionally is almost parallel to the apical horn. (Cells<br />
are often up to 50.4 in width). ' Brachyceroides type 4.<br />
B. Short, wide, tricornute forms, over 45)q in width and 115-170/q<br />
in length. The two posterior horns divaricate slightly.<br />
Carinthiacum type 5.<br />
C. Short or long forms, over 45 ,4 in width; tetracerous under__<br />
conditions of optimal development; the left postequatorial<br />
horn may be either short andtruncated or developed as a distinct<br />
horn. Apical portion is conical, but less tall (than in A), and<br />
usually much flatter, often even capshaped.<br />
1. Postequatorial horns do not divaricate, or divaricate only<br />
slightly. In general, forms are still somewhat thin.<br />
(a)Antapical horn is directed in the sanie direction as the<br />
apical horn, and right postequatorial horn is parallel to<br />
the antapical horn, occasionally slightly divaricating.<br />
Cell body usually is without dorsal convexity (along the<br />
longitudinal axis). Ridges produced by thickening in the<br />
cell membrane are fragile and reticular. Gracile type 6.<br />
(263)<br />
(b) Antapical horn and postequatorial horn point more outwards.<br />
Entire cell bodyis dorsally convex (along the<br />
longitudinal axis). Ridges produced by thickening in the<br />
cell membrane are solid and usually irregular.<br />
2obustum type 7.