History of British animals - University of Guam Marine Laboratory

372 MOLLUSCA. ACEPHALA. Terebratula.with three long plaits ;sides with four or more plaits below the middle beak ;prominent—Anomia striata, Ure, Ruth. 313. t. xiv. f. C.— Ammonitescrumena, Mart. 3.— Derb. t. xxxvi. f. 4—Ter. erum. Soiver. Min. Conch, t.lxxxiii. f. 2, Carboniferous Limestone.42. T. tetraedra— Obtusely deltoid, gibbous, plaited ;front elevated in themiddle, with four or five sharp plaits ; four or more sharp plaits on each side ;beak rather incurved—Sower. Min. Conch, t. lxxxiii. f. 4.— In Oolite.43. T. media.— Very obtusely deltoid ; gibbous, plaited ;front rounded,with a rising in the middle, composed of six sharp plaits approaching thosein the middle ; beak a little incurved.— Sower. Min. Conch, t. lxxxiii. f. 5.—In Oolite.44. T. concinna— Nearly globose ; acutely plaited ;middle elevated byseven plaits ; twelve or more plaits on each side ;beak projectingSower.Min. Conch, t. lxxxiii. f. 6 In Oolite.45. T. obsoleta— Nearly round, gibbous, plaited ; middle of the front a littleelevated by seven plaits ; sides having from seven to eleven plaits ; beakprojecting—Sower. Min. Conch, t. lxxxiii. f. 7. In Oolite.AG. T. plicatilis. Gibbose, transversely obovate, finely and obtusely plaited; middle elevated by twelve plaits ;fifteen or more plaits on each side ;beak slightly projecting. Soiver. Min. Conch, t. cxviii. f. 1. In Chalk.47- T. ocloplicata. Gibbose, transversely obovate, obtusety plaited ;middleelevated by eight plaits; twelve or fourteen plaits on each side; beak projecting.Sower. Min. Conch, cxviii. f. 2. In Chalk.48. T. Wilsoni.— Circular, plaited ; front cylindrical, margin acutely dentated,elevated in the middle with seven plates, nine or ten plates on eachside ; valves compressed towards the beaks.— Sower. Min. Conch, t. cxviii,f. 3—In Carboniferous Limestone at Mordiford, E.S.E. of Hereford.49. T. pectita.— Orbicular, gibbose, plicato-striated, with a flattish spaceextending from the front to the beaks ; beak of the lower valve prominent,slightly incurved, back of the upper valve straight, with an incurved beakSower. Min. Conch, t. exxxviii. f. 1.— In Green Sand.50. T. Lyra. — Oblong, convex, with diverging furcated plaits ; beak of thelower valve greatly elongated, with two longitudinal septa, that of the uppervalve short, incurved—Sower. Min. Conch, t. exxxviii. f. 2 In GreenSand.51. T. acuta— Ovato-triangular, slightly transverse; middle elevated byone large acute angular plait; sides with one large and several small, plaitseach—Sower. Min. Conch, t. cxl. f. 1, 2 Inferior Oolite.52. T. Mantice.— Depressed, subtrigonous ;with 10 angular plaits, half ofthem on one side elevated; upper valve convex— Sower. Min. Conch,t. eclxvii. f. 1.— Carboniferous Limestone, Ireland.53. T. obliqua — Depressed, transversely obovate, with 15 angular plaits,the 5 central ones obliquely elevated from one side ;beak prominent —Sower.Min. Conch, t. eclxxvii. £ 2 In Chalk.54. T. inconstans— Globose, with about 26 angular plaits, half of them, onone side, elevated ; beak incurved.— Soiver. Min. Conch, t. eclxxvii. f. 3, 4Middle Oolite.55. T. dimidiata— Transversely obovate, subdepressed, with a projectingbeak, plaited ; upper valve convex; plaits about 30, half of which, on oneside, are elevated— Sower. Min. Conch, t. eclxxvii. f. 5.— In Green Sand.