A treatise on malacology; or, Shells and shell fish . ^. Neritina Lam, General shape of Nerita; but theouter lip is thin and smooth, the inner one ratherconvex and crenated ; surface smooth. N. meleagris. Chem. 124. f. 1088. a—i. Clitlion Montf. Leach. General shape of Neritina;but there is an obtuse lobe on the inner lip, theouter is dilated at its origin, and the whorls are armedwith spires. C. corona. Chem. 124. f. 1083, 1084. Velotes Mont. Nearly orbicular; depressed; aboveconvex; beneath flat; spire nearly obsolete; innerlip toothed, as large as the aperture, which is semi-circular.
A treatise on malacology; or, Shells and shell fish . ^. Neritina Lam, General shape of Nerita; but theouter lip is thin and smooth, the inner one ratherconvex and crenated ; surface smooth. N. meleagris. Chem. 124. f. 1088. a—i. Clitlion Montf. Leach. General shape of Neritina;but there is an obtuse lobe on the inner lip, theouter is dilated at its origin, and the whorls are armedwith spires. C. corona. Chem. 124. f. 1083, 1084. Velotes Mont. Nearly orbicular; depressed; aboveconvex; beneath flat; spire nearly obsolete; innerlip toothed, as large as the aperture, which is semi-circular. V. perversa. Sow. Man. f. 326. Pileolus Cookson. Shell above patelHform ; spire in-ternal ; aperture beneath small, semilunar; outer lipmargined; inner crenated. P. plicatus. Sow. Man. f. 332. Naviceila Lam. Somewhat patelliform ; oval; convexabove; flat beneath ; aperture large ; inner hp nar-row, thin, assuming the form of a plate across oneend of the under surface ; operculum shelly. *N. elliptica. Sow. Man. f. 323. Family TROCHID^. 109 ,^^ c d. * Unites the Naticidts to the Haliotidce, by Crepidula. 348 SHELLS AND SHELL-FISH, PART II. Shell turbinate, mostly trochiform *, the substance almostalways perlaceous ; outer lip never thickened ; apertureentire, closed by a shelly or horny operculum. SuB-FAM. SENECTIN^. Snake Shells. Operculum round; calcareous; shell turbinate; thebasal whorl ventricose; pillar always smooth ; apertureround, rarely oblique. ^ENECTvsHumph. Imperforate; the baseproduced into a broad flat lobe ; spirerather elevated and pointed; thewhorls convex; aperture perfectlyround; not more oblique than Helix ;inner lip entirely wanting, {fig. 110.)
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectmollusks, bookyear184
