History of British animals - University of Guam Marine Laboratory

•atThociius. MOLLUSC A. TROCHUSIDvE. 325sulcus around the middle ; base flattish.—Sower. Min. Conch, t. ccxx. f. 3.—Inferior Oolite.15. T. pallium Conical, depressed, with concentric furrows, and divergingstrife ; whorls above depressed, with many tubercular undulations ;in themiddle flattened, with a longitudinal band ;base convex, umbilicated ; marginlargely crenulated. — Sower. Min. Conch, t. ccxxi. f. 1—Inferior Oolite.16. T. tiara.— Depressed, conical, with diverging striae ;volutions obscurelybicarinated, deeply undulated above, concentrically striated beneath ; baseconvex, with a large pillar-cavity—Sower. Min. Conch, t. ccxxi. f. 2—GreenSand.17. T. Sedgwicki Conical, smooth ; base carinated ;whorls concave above,convex below ;margin and base striated—Sower. Min. Conch, t. cclxxii. f. 1.— Suffolk Crag.18. T. imbricatus r-Pyramidal, with several transverse threads upon eachwhorl, crossed by fine longitudinal striae whorls ; angular, imbricating, flatabove,—very convex beneath ; pillar-cavity closed. Sower. Min. Conch, t.cclxxii. f. 3, 4 In Lias Clay.19. T. reticularis Conical, transversely reticulato-striated ; whorls bicarinated; base convex Sower. Min. Conch, t. cclxxii. f. 2— Upper Oolite.20. T. Gibsii Conical, short, umbilicated ; sides straight; edge obtuselycarinated ;base convex, reticulato-striated ,•in the centre of the upper partof the whorls, is an elevated band, crossed by curved striae ; aperture rhomboidal—Sower.Min. Conch, t. cclxxviii. f. 1—Chalk Marl.21. T. extensus.— Depressed, conical ; above rugged, obliquely striated ;beneath convex, smooth base ; expanded, with a broad undulated thin margin; aperture oblong ; pillar-cavity not plicated, closed when old.— Sower.Min. Conch, t, cclxxviii. f. 2, 3—London Clay.22. T. monilifer Conical, transversely striated ; volutions rather convex,with three rows of tubercles, and crenated edges;base slightly convex, bearingsix rows of granules ; aperture quadrangular ; pillar-cavity, along oneedge of the aperture, truncated. (T. nodulosus, Brander, Toss. Hant. f. 6.)— Soioer. Min. Conch, t. ccclxvii—London Clay.23. T. linearis.—" Conical, wreaths slightly convex, transversely striated,with a prominent line along the centre and base of each volution ;base flat ;umbilicus obscured by the last volution ;aperture transversely depressed."—Mantell, Geol. Suss. 1 10. t. xviii. f. 17- In grey chalk-marl. Indications of threeother species, from the same formation, are ib. t.given byMrMantell, xviii.f- 9- and 16.f. 7-Gen. SOLARIUM.— Pillar cavity spreading,at the margin of the whorls.and crenulated1.S.patvlum Depressed, whorls smoothish; margin keeled and crenulated;margin of the cavity strongly denticulated. Sower. Min. Conch, t. xi. ; lowerright hand figures—In London Clay.2. S. discoideum.-=-T)iscoh\, outer edge sharply carinated ; edge of the pillarcavityrounded, transversely wrinkled ; aperture obliquely elliptical, pointedeach end. Sower. Min. Conch, t. xi. ; upper right hand figures—LondonClay.3. S. conoideum Conical, smooth ; aperture quadrangular ; pillar-cavitydeep, narrow.— Sower. Min. Conch, t. xi. ;three middle figures.— Upper Oolite.