Manual of conchology, structural and systematic Volume 16 ; with illustrations of the species - Tapa blanda

Sinopsis

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 Excerpt: ...Nat. Aplys., p. 51, pl. 4, f. 7-9.--Dolabrifera ascifera Morch, Mai. Bl., xxii, p. 176.--Sowb., Conch. Icon., xvi, pl. 1, f. 6a, 6b.--Bergii, Verb. k.-k. zool.bot. Gesellsch. in Wien., xxii, 1872, p. 441, pl. 5, f. 25-29; pl. 6, f. 1-10 (anatomy). Externally of the same form as D. dolabrifera, but the back is more rounded; but distinguished by the yellowish-brown color of the surface which is strewn with numerous obtuse projections, like little warts. The dorsal slit is very small, mantle a little larger than in D. dolabrifera. The shell also shows sufficiently recognizable differential characters, being wider in the middle, more angular, and especially thicker in the center, which is calloused and enamelled; the apex is more calloused and quite small. This shell is the most calcareous of the genus. It is perfectly white. Figures 19, 20, 29 are from the original illustrations of Rang. Fig. 17 is a smaller shell copied from Sowerby. My description is from Rang. The dentition has been worked out by Bergh from specimens collected by Riise. His figures are here reproduced. Pi. 65, figs. 10, 11, shell; pl. 67, fig. 25, median and first lateral teeth; fig. 21, laterals from inner fifth of a row, from the side; fig. 24, laterals of the following fifth, from above; fig. 22, laterals from the third fifth, viewed from the side; fig. 23, the outermost laterals. D. Swiftii n. sp. Pi. 67, figs. 19, 20. Soft parts unknown. Shell trapezoidal with projecting beak, well curved, moderately solid, but not much calloused within; white with thiu yellowish cuticle. Sinus long, concave; left margin straight; basal or anterior margin truncated at « right angle with the left margin, and ditinctly emarginate; right margin below the sinus parallel with the left, but gently conve...

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