. Echinoidea . Fig. 25. Apical area of Echiiiocardium inedito'ranctiui 4 T. After the revision of the species of Echiiiocardium given here it will perhaps not be found useless to give an anal}tical table of all the species hitherto recognized with certainty.

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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1903