. Echinoidea . Fig. 10. Fig. II. Fig. 10. Valve of tridentate pedicellaria of Aræosoma violaceum. Obj. AA. Oc. II. (Zeiss). Fig. II. Valve of ophicephalous pedicellaria of Hygrosoma Petersii. Obj. AA. Oc. I. (Zeiss).

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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1903