History of British animals - University of Guam Marine Laboratory

39£ MOLLUSCA. TROCHUSID.E. Tkochus.Breadth about an inch, height one-fourth less; variously marked withred, blue, and white ; base slightly convex ; whorls spirally striated ; theupper part of the two last waved or tuberculated, and a raised rib round thebase of each; pillar cavity wide, with an open spiral groove.— Specimens ofa shell exactly corresponding with Turbo carneus of Mr Lowe (Zool. Journ.vol. ii. p. 107. t. v. f. 12. and which Mr Gray has identified with the Margaritastriata of Leach (Ross's Voyage of Discov. App.), Zool. Journ. vol. ii. 567.),which I found plentifully in Zetland, were sent to Mr Montaguin 1809, whopronounced them the fry of a Trochus. There can be little doubt of theirrelation to the present species.282. T. umbUicatus.— Spire bluntly conical ;whorls nearlyeven,obsoletelystriated at the base.T. ci - ebris striis fuscus, List. An. Aug. 1669. t. iii. f. 15. Conch. Dcxli.f. 31.— T. umbilicaris, Penn. Brit. Zool. iv. 126.—T. cinerarius, Don.Brit. Shells, t. lxxiv. three middle figures.— T. umbilicatus, Mont. Test.Brit. 286—On Fuci near low water-mark.Breadth fths, height fths of an inch ; whitish, with waved purple stripes.Whorls five, imperfectly marked by the separating line ; striated, smooth ;pillar cavity with sloping wrinkled sides ; the margin of the cavity and ofthe body whorl rounded.283. T. cinerarius.— Spire subdepressed, with a minuteapex ; whorls with a well defined separating line ;stronglystriated at the base.Penn. Brit. Zool. iv. 12/. Don, Brit. Shells, t. lxxiv. two upper andtwo lower figures. Mont. Test. Brit. 284—Near low water-mark.Height and breadth about §ths of an inch ;grey, with numerous lines ofpurple whorls five ; ; strongly striated, the striae interrupted by the lines of: the tentaculagrowth, giving the surface a rough feel ; pillar cavity largeand lateral filaments not so dark nor so strongly marked with annular ringsas the preceding.— I am not satisfied with the claims of this species as distinctfrom the preceding. They are probably only varieties constituting theTrochus cinerarius of Linnaeus.— 284. T. tumidus. — Whorls subquadrangular, with numerousspiral striae slightly decussated by the lines of growth.Mont. Test. Brit. 280. t. x. f. 4. 4.— In deep water.Length about ^gths, and breadth about 3,