A treatise on malacology; or, Shells and shell fish . ter lip thickened, and are with- 298 SHELLS AND SHELL-FISH. PART II. short; the base truncate and emarginate, or with ashort recurved channel; inner lip toothed or plaited.* Harpa Lam. Varices numerous and regular^ forminglongitudinal ribs, coronated near the suture ; apertureand lips highly polished ; base truncate {fig. Q5. b^c).muhicostata. Sow. Gen. crenata Sw. Bligh, Cat. CypRiECASsis Stuclibury. Shell oblong, oval, ventri-cose, without varices; spire very small; aperturecypraeiform ; outer lip thickened, convex, and ad-vancing on
A treatise on malacology; or, Shells and shell fish . ter lip thickened, and are with- 298 SHELLS AND SHELL-FISH. PART II. short; the base truncate and emarginate, or with ashort recurved channel; inner lip toothed or plaited.* Harpa Lam. Varices numerous and regular^ forminglongitudinal ribs, coronated near the suture ; apertureand lips highly polished ; base truncate {fig. Q5. b^c).muhicostata. Sow. Gen. crenata Sw. Bligh, Cat. CypRiECASsis Stuclibury. Shell oblong, oval, ventri-cose, without varices; spire very small; aperturecypraeiform ; outer lip thickened, convex, and ad-vancing on the spire ; inner margin regularly toothed;inner lip thickened, convex, and spreading on thebody-whorl, without being detached ; pillar angu-lated internally, and crossed by uniformly slenderplaits ; canal very short, reposing on the body-whorl;aperture very narrow,with a recurved channel above. testiculus. Mart. f. 375. ? crumena. Mart. 37. f. 379. rufa. lb. 32. f. .341. harpjBformis. Lam. No. Cassis Lam, Shell ponderous, marked with varices;. out any varices. There is, in fact, every modification of shape among theTritons as they now stand ; some have the aperture wide, others narrow:the channel is either very long or truncate ; the spire greatly lengtlienedor greatly depressed ; the pillar toothed or smooth ; the varices cither alter-nate or none. But, the suh-genera not having been determined, I leave the group in this confused state. These facts, better than any theoreticalarguments, show the absolute necessity of defining the sub-genera. * Except in Dolium and Harpa. f Uniting this genus to Harpa. PART II. CASSINiE. NASSINJE. 299 outer lip (typically) considerably dilated, with a pro-minentj callous, and detached rim ; inner lip inflected,broad, flattened, dilated in the middle, and toothed ;aperture narrow, irregular, {fig. 65. «.)cornuta (type). Chem. pi. Meth. 406. f. 3. 184, 185. (Jfiff. 65. a.) (Aberrant.) tuberosa. Mart. 38. f. 382. fasclata. Mart
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectmollusks, bookyear184
