Author: SPRINGER, FRANK
Title: Unitacrinus: its structure and relations.
Description: 1901. Mem. Mus. Comp. Zool. Harvard Coll. Vol. XXV, No. 1; 89 pp. figs. 8 plts. h.t. Complete issue, front cover frayed and loose, back cover missing, spine worn and loosening, contents and plates very good, lg4to.

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