History of British animals - University of Guam Marine Laboratory

Anomia. MOLLUSC A. OSTREAD^. 395Ostrea sylvestris, List. Conch, t. ccv—A. elect. Linn. Syst.i. 1151.Turt. Biv. Brit. 227- t. xvii. f. 8, 9—West coast of Ireland, Dr Turton.About an inch and a quarter in diameter ; colour bright transparent yellowinside and out ; surface irregular, but not rough, plaited or scaly ;beakpointed, not quite terminal ; the under valve flat, and scale-like, with a largeinterrupted perforation.- 390. A. ephippium.— Shell orbicular-oval, rather rough,wrinkled and plaitedat the margin, and partlywithin.Ostreum parvum,List. An. Aug. 181. Conch, t. 204. An. Eph. Linn.i.Syst. 3.— 1150. Mont. Test. Brit. 155. Turt. Biv. Brit. 227. t. xviii.f. 1, On rocky coasts, common.Sometimes three inches in diameter, more or less pearly, and tinged withgreen surface more or less ribbed ; longitudinally, and becoming scaly withage ; operculum oval, large, thick, rough.391. A.cepa.— Shell oboval, flattish, rough; rosy -red within,but not pearly.Linn. Syst.i. 1151. Turt. Biv. Brit. 228. t. xviii. f. 4.— Rocks at lowspring-tides in Torbay, Dr Turton.Length 2, breadth ] h inches, oblong, inclining to oval, rather flat, with arough but not an undulating surface ; beaks terminal ; the under valve thinbut not scaly.392. A. squamula.— Shell somewhat orbicular, smooth, transparent,and horn-coloured.Linn. Syst.i. 1151. Mont. Test. Brit. clvi. and Dlxxxi. Turt. Biv. Brit,ccxxix. t. xviii. f. 5, 6, 7—On stones, shells, and sea-weeds.Diameter about half an inch ; flat, or a little tumid about the beaks, andsmooth. The substance is always thin and brittle ; the plug of attachment istendinous, seldom hard at the base, with a testaceous termination.393. A. undulata.— Shell rounded, or oblong, with longitudinalrounded striae, and a triangular cavity on the under valve,beneath the hinge.Ostrea subviridis, List. Conch, t. ccii.— O. striata, Mont. Test. Brit, cliii.and dIxxx.— An. und. ib. 157. Turt. Brit- ccxxx. t. xviii. £ 8, 9, 10.—On old shells and the crevices of rocks.Diameter upwards of an inch ; variable in figure and consistence ; margincrenate, inside iridescent ; on one side of the perforation in the under valve,is a triangular striated cavity ; the plug terminates in a thin oval layer,strongly striate transversely, and crossed with fine longitudinal lines.« 394. A. -punctata.— Shell orbicular, with raised dots on theupper valve, and concave ones on the under valve.Turt. Biv. Brit, ccxxxi. t. 18. f. 11.—On crabs and shells, on the southcoasts of England.Diameter about half an inch, thin, transparent, purplish white ; a littletruncate at the base ; beaks terminal.— 395. A. cylindrica.— Shell oval, somewhat cylindricallyconvex,and transversely rugged, with the beak curved backwards.