History of British animals - University of Guam Marine Laboratory

Cbenaxula. MOLLUSCA. PERNADjE. 3912. G ? acuta—Ovate lanceolate, oblique, narrow, depressed, slightly curved;anterior extremity acute; teeth in the hinge variously disposed.—Sower. Min. Conch, t. dx. f. 5.—In Calcareous Sandstone, at Collyweston.3. G. aviculoides Obliquely ovato-lanceolate, curved; both extremities—pointed ; hinge-line nearly half the length of the shell ; hinge-teeth few.Sower. Min. Conch, t. lxi. and t. Dlxvi In Green Sand and Oolite.Gen. CRENATULA.—Shell subequivalve, depressed;hingewith numerous pits, without teeth for the receptionof theligament.1. C. venlricosa Ovate, elongated,ventricoso-carinated ; posterior*sideimpressed ; beaks pointed—Sower. Min. Conch, t. ccccxliii ?2. C. Listen.—List. Conch, t. cccclxvii. f, 34-6—Park. Org. Rem. iii. 220.t. xv. f. 5— Upper Oolite.3. C. producta Park. Org. Rein. iii. 221. t. xv. f. 6, 7— " In a Marl-pitnear Shefford, in Bedfordshire."Gen. INOCERAMUS.— Shell inequilateral, irregular;hingea marginal, subcylindrical, transverselysulcated callus, supportinga ligament beaks ; conspicuous at one end of thehinge.1. I. Cuvieri— Obovate, curved, convex, with transverse, distant, obtusewaves ; posterior side concave, with a small lobe near the beak Sower.Linn. Trans, xiii. 457-—Mant. Suss. 213. t. xxvii. f. 4. t. xxviii. f. 1-4—CatillusCuvieri, Cuvier, Oss. Foss. ii. 251. t. iv. f. 10 Sower. Min. Conch.t. ccccxli. f. 1—In Chalky— 2. I. Brongniarti. Oblong, gibbose, with large transverse undulations ;anterior side angular, lobed ; posterior side flat, truncated and smooth ;beakssmall, curved, and pointed —Mant. Suss. 214. t. xxvii. f. 8 Sower. Min.Conch, t. ccccxli. f. 2, 3 In Chalk.3. mytiloides— I. Equivalved, elongated, depressed, with slight irregularwaves ;convex and obtuse towards the beaks ;hinge-line oblique ; anteriorside produced ; beaks short—Mant. Suss. 215. t. xxviii. £ 2—Sower. Min.Conch, t. ccccxlii.— In Chalk.4. I. cordiformis— Equivalved, heart-shaped, transversely and interruptedlywaved ; beaks large, incurved ; anterior side angular—Sower. Min. Conch,t. ccccxl.— In Chalk.5. I. concentricus— Unequivalved, ovate, one of the beaks muchincurved— produced,{Park. Geol. Trans, v. 58. t. i. f.A.)— Sower. Min. Conch, t. cccv.—In Chalk Marl.6. I. sulcatus— Unequivalved, oblong, with prominent beaks, and about,nine large longitudinal plaits; beak of one valve, incurved, acute.— (Park.Geol. Trans, v. 59. t. i. f.5.)— Sower. Min. Conch, t. cccvi.—In Chalk Marl.7. I. Lamarkii.-—Valves equal, very convex, with a few obscure longitudinalundulations, and distant transverse ridges; surface covered with numerousconcentric striae ; posterior slope subdepressed ;anterior side lobate, expanded;hinge nearly transverse— (Park. Geol. Trans, v. 55.) Mant.Suss. 214. t. xxvii. f. 1 In Chalk.