Manual of Conchology; Structural and Systematic, Vol. 2: With Illustrations of the Species; Zontidæ (Classic Reprint) - Softcover

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Excerpt from Manual of Conchology; Structural and Systematic, Vol. 2: With Illustrations of the Species; Zontidæ

Animal protected by a spiral, heliciform shell, within which it is completely retractile; tail provided with a caudal mucus pore; jaw with a median inferior projection, not ribbed; the central tooth in the lingual ribbon is tricuspid, with the middle cusp long and narrow, laterals bicuspid, marginals acuminate, unicuspidate or bicuspidate.

Shell usually heliciform and perforate or umbilicate, often thin, and more or less transparent, the lip of the aperture sim ple, neither reflected nor with thickened margin.

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