A manual of the Mollusca, or, A rudimentary treatise of recent and fossil shells . at theirouter bases ; foot bi-lobed in front; branchial plume long, pectinated, parti-ally exserted on the right side, w^hen the animal is walking. Lingual teethbroad; uncini 3, lanceolate ; all hooked and denticulated. Disir., 6 sp. Brit., N. America. Fossil, 19 sp. Wealden—. Brit., Belgium, &c. PAMILY VIII. Neritid^. Shell thick, semi-globose; spire very small; cavity simple, from theabsorption of the internal portions of the whii-ls; aperture semi-limate; colu-meUar side expanded and flattened; outer lip acut
A manual of the Mollusca, or, A rudimentary treatise of recent and fossil shells . at theirouter bases ; foot bi-lobed in front; branchial plume long, pectinated, parti-ally exserted on the right side, w^hen the animal is walking. Lingual teethbroad; uncini 3, lanceolate ; all hooked and denticulated. Disir., 6 sp. Brit., N. America. Fossil, 19 sp. Wealden—. Brit., Belgium, &c. PAMILY VIII. Neritid^. Shell thick, semi-globose; spire very small; cavity simple, from theabsorption of the internal portions of the whii-ls; aperture semi-limate; colu-meUar side expanded and flattened; outer lip acute. Operculum shelly, sub-spiral, articulated. At each end of the columella there is an oblong muscular impression,connected on the outer side by a ridge, on which the operculum rests; Avithiuthis ridge the inner layers of the shell ai-e absorbed. Animal ^vith a broad, short muzzle, and long slender tentacles ; eyes onprominent pedicels, at the outer bases of the tentacles; foot oblong, dentition similar to the turlinidce. Teeth 7 ; uncini very \^g^.iSi Fig. 85.*Fig. 85. Nerita polita, L. (from Quoy and Gaimard) New Ireland. GASTEROPODA. 141 Nerita, L. Nerite. EUjm. Nerites, a sea-snail, from nereis. Ti/pe, N. ustnlata, PL IX., fig. 35. SheU thick, smootli or spirally grooved; epidermis horny; outer lipthickened and sometimes denticulated within; columella broad /A and flat, with its inner edge straight and toothed; operc. fh. j\ sheHy, fig. 86. -W/A I Distr., 116 sp. Nearly all warm seas. W. Indies, Red ^if^^^jSea, Zanzibar, Philippines, Australia, Pacific, W. America, ^-V^XJs^(Cuming). Fig. 86.* Fossil, 60 sp. Lias—. Brit. &c. The palseozoic nerites are referred byDOrbigny to turbo, natica, &c. N. haliotis is a pileopsis. Sub-genera. Neritoma, Morris, 1849. N. sinuosa. Shy. Portland stone,Swindon. (Mus., Lowe). SheU ventricose, thick; apex eroded; aperturewith a notch in the middle of the outer lip. Casts of this shell are common,and exhibit t
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmollusks, bookyear185
