History of British animals - University of Guam Marine Laboratory

302 MOLLUSCA. PECTINIBRANCHIA. Tueeitella.212. P. decussata.— Whorls eightor nine, strongly striatedtransversely ; minutely striated spirally.Helix dec. Mont. Test. Brit. 399. t. xv. f. 1—On the shore atWeymouth,Mr Bryer.Length /jjths of an inch 1; breadth I 5 th ; white, slender ;whorls nearlyflat, the separating line extremely fine ; aperture narrow, suboval, contractedat both ends ; outer-lip somewhat expanded, and a little thickened at theback ;inner lip slightly replicated.213. P. pallida.— Whorls six or seven, smooth ;outer-liparcuated.Turbo pal. Mont. Test. Brit. 325. t. xxi. f. 4—In sand, Salcomb Bay.Length |th of an inch ; breadth §ds less ; slender, tapering to a fine point ;whorls separated by a well-defined line ;aperture suborbicular, a faint duplicatureon the pillar-lip, forming behind a small cavity.In the Mineral Conchology, the followingfossil shells are referred to thegenus, though it is more probable that they belong to Limnea or Paludina.1. P. orbicularis Conical, acute, smooth ;whorls about six, ventricose ;aperture nearly round.—Sower. Min. Conch, t. clxxv. f. 1.— Freshwater Limestone,Shalcomb, Isle of Wight.2. P. angulosa.— Conical, smooth ; whorls subcarinated ; aperture nearlyround Sower. Min. Conch, t. clxxv. f. 2.— Along with the last.3. P. minuta.— Elongated, smooth ;whorls five or six ; obscurely squared ;Along with the last.aperture oblong. — Sower. Min. Conch, t. clxxv. f. 3—Gen. XLIX. TURRITELLA—Shell elongated;the whorlsnumerous, produced ; aperture wide ;the pillar-lip slightlyrounded.214. T. terebra.— Whorls about sixteen, with numerous spiralridges.Buccinum tenue, List. An. Ang. 161. Conch, t. nxci. f. 57. Turbo Ter.Linn. S. i.Syst. 1239. Penn. Brit. Zool. iv. 130. t. Lxxxi. f. 1 13. Mont.Test. Brit. 293—Common.Length sometimes exceeding two inches ; breadth of the body-whorl halfan inch, of a reddish or purplish brown ;whorls sometimes eighteen in number,ending in a fine point the ; larger whoi-ls rounded, with five or six prominentridges, besides smaller ones, crossed by the layers of growth. In theyoung shells the ridges are less numerous, and the anteal edge of the bodywhorlis flattened. The aperture, in young shells, is ;subquadrangular in anold specimen the outer lip is round and thin, and the pillar-lip nearly straight.The animal — is yellow, striped with dusky, with the tentacula short. Thisspecies resides in deep water, but is frequently thrown ashore after storms-215. T. exoleta.— Whorls about twelve, spirally striated, withtwo broad rounded spiral ridges.Cochlea variegata, List. Conch, t. Dxci. f. 58.— Turbo exol. Linn. Syst.i.1239 Turbo cinctus, Don. Brit. Shells, t. xxii. f. 1. Mont. Test.Brit. 295.—On the English coast, rare.