Manual of Conchology, Structural and Systematic, Vol. 8: With Illustrations of the Species; Naticidæ, Calyptræidæ, Turriteliddæ, Vermetidæ, Cæcidæ, ... Turbonillidæ, Pyramidellidæ (Classic Reprint) - Softcover

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Excerpt from Manual of Conchology, Structural and Systematic, Vol. 8: With Illustrations of the Species; Naticidæ, Calyptræidæ, Turriteliddæ, Vermetidæ, Cæcidæ, Eulimidæ, Turbonillidæ, Pyramidellidæ

The Nidus (pi. 7, figs. 44, 45) is unlike that of any other mollusk in form and composition, being built up largely of the sand of the sea-bottom, agglutinated into a strap, forming part of a circle, and provided on one side with a constriction or rim the walls contain the eggs, arranged in quincunx order.

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