History of British animals - University of Guam Marine Laboratory

Terebratula. MOLLUSCA. ACEPHALA. 371convex ;front defined by two angles, or emarginate ; edge becoming bluntby age Sower. Min. Conch, t. ccccxxxv. f. 5— Upper Oolite.27- T. globata.— Subglobosefront elevated with two obtuse; folds, andslightly produced surface often minutely punctated—Sower. Min. Conch.;t< ccccxxxvi. f. 1.— Upper Oolite.2!J. T. perovalis.— Ovate, convex, with two elevated sinuses at the front,which is depressed between them ; beak incurved—Sower. Min. Conch, t.ccccxxxvi. f. 2, S— Under Oolite.29. T. maxillata— Subquadrangular, convex ; two acute rising sinuses inthe front, and one obtuse sinus on each side ; three conspicuous furrows inthe upper, and two in the lower valve ; front rounded—Sower. Min. Conch,t. ccccxxxvi. f. 4.— Upper Oolite.30. T. Sella Subquadrangular, convex ; front considerably elevated, narrow,emarginated when old sides ; depressed, slightly rounded—Sower. Min.Conch, t. ccccxxxvii. f. 1.— Upper Oolite.31. T. obtusa.— Subovbicular, rather depressed;front broad, elevated ;edge obtuse Sower. Min. Conch, t. ccccxxxvii. f. 4.—From Cambridge.32. T. obesa Ovate, gibbose, front elevated considerably, with a slightbroad sinus in the middle ; beaked valve regularly convex to the edge;beakincurved, short Sower. Min. Conch, t. ccccxxxviii. f. 1.— In Chalk.33. T. bucculenta.— Rather square, with rounded sides, convex ; front produced,truncated, very slightly elevated ;t. ccccxxxviii. f. 2.— In Green Sand.beak short Conch.—Sower. Min.34. T. triquetra Suborbicular, with a produced incurved beak ; valvesequally convex ; front slightly indented ; beak obtusely keel-shaped, with acai'ina on each side Sower. Min. Conch, t. ccccxlv. f. 1—In Oolite.35. T. indentata Elliptical, smooth, more or less gibbose ; valves equallyconvex;front deeply notched; beak small, much incurved—Sower. Min.Conch, t. ccccxlv. f. 2.— In Limestone at Banbury.36. T. Sacculus.—Obovate, gibbose, with a longitudinal groove along thelarger valve ; the smaller valve slightly grooved; front emarginate—Anomiakevis, Ure's Ruth. 313. t. xvi. f. 0.—A sacculus, Martin's Derb. t. xlvi. f. 1, 2.— Ter. Sacc. Sower. Min. Conch, t. ccccxlvi. f. 1.— In Carboniferous Limestone.37- T. hastata Elliptical, subrhomboidal, rather depressed; front truncatedand indented ; edges sharp—Soiver. Min. Conch, t. ccccxlvi. f.—2, 3.Greywacke Limestone, Cork.38. T. cornuta Short, convex, with blunt edges,four-lobed ; the twomiddle lobes produced the others very short— Sower. Min. Conch, ccccxlvi.;£ 4.— In Oolite.39. T. ambigua Subpentangular, gibbose, perforated valve with a broadmesial groove, with a mesial ridge, having a shallow central furrow enlargingat the margin.— Spirifer ambiguus, Sower. Min. Conch, t. 376— CarboniferousLimestone.** Margin of the valves dovetailed.40. T. lateralis.— Oval, broader than long, gibbous;middle of the frontmuch elevated, with three deep but short plaitssides with two ;plaits each,much below the middle—Sower. Min. Conch, t. lxxxiii. f. 1.—In CarboniferousLimestone.41. T. emmena.— Deltoid, gibbous, plaited; middle of the front elevated,A a 2