Structural and Systematic Conchology (Volume 2); An Introduction to the Study of the Mollusca - Softcover
Synopsis
This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1883. Not illustrated. Excerpt: ... developed, usually soldered by its extreme edge to the last whorl, and forming over the umbilicus an arch, having the opening larger than the aperture of the shell. S. Philippiana, C. B. Ad. (lxxvii, 45, 46). Proserpina, Guilding. Syn.--Odontostoma, d'Orb. Distr.--7 sp. West Indies, Northern So. America. P.depressa, d'Orb. (lxxvii, 47). Shell orbicular-depressed, polished, covered at the base by a shining callus; aperture semioval, lip sharp; columella and parietal wall with dentiform lamellae. No operculum. Proserpinella, Bland, 1865. Columellar fold absent; having a single parietal tooth. P. Berendti, Bld. Mexico. Cyane, H. Ad., 1870. Columella truncate below. P. Blandiana, Ad. Peru. Ceres, Gray. Distr.--2 sp. Mexico. G. eolina, Duclos (lxxvii, 49). Shell heliciniform, carinated at the periphery, upper surface rugose, epidermis thin, callous at the base ; lip sharp, with spiral laminae within the aperture; columella with dentiform laminae. Order SCUTIBRANCHIATA. Branchiae pectinated, placed in a cavity in the upper part of the neck, or at the inferior edge of the mantle, around the foot. Dioecious. Shell usually spiral (globular or pyramidal) or conical, holostomate. Suborder Podopthalma. Shell spiral. Operculum usually present and paucispiral or multispiral. Eyes on peduncles, separate from the tentacles. Suborder Edriopthalma. Shell conical, not spiral; no operculum; eyes sessile. Suborder PODOPTHALMA. Family. NERITID^E. Shell thick, semiglobose,porcellanous; spire very small; cavity simple, from the absorption of the internal portions of the whorls; aperture semilunate; columellar side expanded and flattened; outer lip acute. Operculum shelly, subspiral, articulated. At each end of the columella there is an oblong muscular impression, connected on the outer...
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