History of British animals - University of Guam Marine Laboratory

364 MOLLUSCA. FISSURELLAD^. Fissurella.Shells, t. xxi. f. 1. Mont. Brit. Shells, 486.— On rocks and shells inrather deep water.Breadth sometimes reaching to an inch and a half; white, with a carnationtinge ; cuticle brown, rough with a pilose margin ; aperture round,slightly waved.360. C. antiquatus.— Apex blunt, the layers of growth formingconcentric scale-like wrinkles.Patella rugosa, List.. Conch, t. Dxliv. f. 31. ?— P. ant. Linn. Syst.i. 1259.Pult. Dorset. 51.—Mont. Test. Brit. 485—On different parts of thecoast, rare.Breadth about half an inch ; thick, opake, white, apex variable in form;aperture oval or round.— 361. C. militaris. — Shell decussated by longitudinal andtransverse striae.Patella alba, List. Conch, t. oxliv. f. 32—P. mil. Pult. Dorset. 51. Don.Brit. Shells, t. clxxi. Mont. Test. Brit. 488. t. xiii. f. 11.— On differentparts of the coast, rare.Breadth about half an inch ; subpellucid, white ; cuticle brown, pilose ;apex much reflected and recurved ; aperture round ; inside glossy white.EXTINCT SPECIES.1. C. unguis Depressed, suborbicular, obscurely radiated ; vertex oblique,recurved, extended beyond the base, acute.— Patella unguis, Sower.Min. Conch, t. cxxxix. f. 7-— In Crag, Holywell.FISSURELLADiE.Gen. LXXXVIII. FISSURELLA.—Shell ovate, conical,with a perforated apex; tentacula with eyes at the externalbase.362. F. grceca.— Oval, decussated by unequal longitudinalribs and transverse stria? ; apex truncated.Patella cancellata, List. Conch, t. Dxxvii. f. 2. — P. graeca, Linn. Syst.i.1262 Penn. Brit. Zool. iv. 144. t. lxxxix. f. 153 P. reticulata,Don. Brit. Shells, t. xxi. f. 3. — Western coasts, not common.Length of the aperture about three quarters of an inch, breadth half aninch ; height a quarter ; thick, brown, inside white or rayed with brown ;perforation of the apex oblong margin of the ;aperture waved, crenulated.363. F. apertura.— Conical, with a reflected subspiral apex.Patella apertura,Mont. Test. Brit. 491. t. xiii. f. 10.— South of Englandand Zetland.Length about §ths, height |th, subpellucid, white, strong, the longitudinaltubercled ribs crossed by a few circular ridges apex ; adhering, the perforationin front rhomboidal ;margin of the aperture oval, crenated by the ribs.