A treatise on malacology; or, Shells and shell fish . n. f. 1—5. Dendrostran Sw. Shell irregular, equivalve, attached by its lower valve by extraneous processes; the margins solid and plicated. D. folium. Sow. Gen. f. 3. crista-galli. Sow. Gen. f. , lb. f. 1. Ostrcea Linn. Shell irregular, round or oval, inequi-valve ; the margins thin and brittle ; no teeth; um-bones central. O. edulis. Sow. Gen. f. 2, cingulata. lb. f. lb. f. 1. Gryph(jea Lam, Shell regular,inequivalve ; one valve con-vex, with the umbo recurved,the other smaller, and nearlyflat; margin of the valves n
A treatise on malacology; or, Shells and shell fish . n. f. 1—5. Dendrostran Sw. Shell irregular, equivalve, attached by its lower valve by extraneous processes; the margins solid and plicated. D. folium. Sow. Gen. f. 3. crista-galli. Sow. Gen. f. , lb. f. 1. Ostrcea Linn. Shell irregular, round or oval, inequi-valve ; the margins thin and brittle ; no teeth; um-bones central. O. edulis. Sow. Gen. f. 2, cingulata. lb. f. lb. f. 1. Gryph(jea Lam, Shell regular,inequivalve ; one valve con-vex, with the umbo recurved,the other smaller, and nearlyflat; margin of the valves incurva {) Sow. Gen. f. 2. dilatata. lb. f 3. PUcatula Lam. Shell irregularly ovate, plicated, in-equivalve ; one valve more convex than the other ;cardinal teeth ^ sagittate ; the sides strongly, regu-larly, and transversely grooved; between the teeth isthe internal ligament, (^fig. I29. e.) P. gibbosa. Sow. Gen. f. 1, 2. Anomia Linn. Shell thin, perlaceous, very irregular,inequivalve ; attached by a calcareous mass, which. c c 3 SQO SHELLS AND SHELL-FISH. PART II. passes through an opening near the umbo of thelower or smaller valve, which is flat; the other isconvex. () A. Ephippium. Sow. Man. f. 186. Placuna Brug. Shell very much compressed^ per-laceous^ with two internal lamellar, sagittate, cardinalteeth in one valve, {fig. 129- h, c.) Placunomia.* Shell attached, with the form and gene-ral structure of Anomia, but with two sagittate car-dinal teeth. Cumingii. Sow. Man. f. 189. Placuna Brug. Shell not attached, foliaceous, roundish ;the valves equally flattened: united to Pecten byPleuronecta. P. placenta. En. M^th. 173. f. 2. Family 5. River Oysters. Irregular, inequivalve, foliaceous ; pearly within ; epi-dermis olive green ; ligament partly internal and partlyexternal. Etheria Lam. Muscular impressions two; shell irre-gular ; teeth none. E. semilunata. Sow. Man. f. 155. MuLLERiA De Per. Muscular impression single ; shellsub
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectmollusks, bookyear184
