Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 649
shed by the Eay Society). f It was by Prof. Ehrenberg that the existence of such casts in the GreenSands of various Geological periods (from the Silurian to the Tertiary) wasfirst pointed out, in his Memoir Uebev der Griinsand und seine Einlauterungdes organischen Lebens,in ;Abhandlungen der… … Internal Cast of Polystomella craticulata:—a, retral pro-cesses, proceeding from the posterior margin of one of thesegments ; b, 61, smooth anterior margin of the same segment;c, c\ stolons connecting successive segments, and unitingthemselves with the diverging branches of the meridionalcanals ;…
Microscopy · Biology
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