History of British animals - University of Guam Marine Laboratory

C2U MOLLUSCA. CEPHALOPODA. Ammonita.45. A. Parkinsoni Wiorls numerous, exposed ; ribs numerous, elevated,slightly arched, bifid near the front, which isvery narrow, and plain ; apertureoblong.— Sower. Min. Conch, t. cccvii.—In Lias, Bath.46. A. dentata.— Whorls increasing rapidly, inner ones much concealed,umbilicate, front squace ribs ; prominent, and forked near their commencement,terminating upon— the edges of the front. A. serratus {Parkinson,Trans. Geol. v. 57-) Sower. Min. Conch, t. cccviii—Chalk-Marl.47. A. perampla Discoid, whorls 4, half concealed, ventricose, frontrounded, plain ; ribs few, large, obtuse ; aperture transversely oval. — ManteWsFossils of the South Downs, p. 200. — Sower. Min. Conch, t. ccclvii.—InChalk, South Downs.48. A. Lewesiensis.— Whorls rapidly increasing in size, depressed, the innerones half exposed ; ribs large and obtuse ; front narrow, rounded, plain ;aperture sagittate. — MantelPs Fossils, p. 199. t. 22. f. 2—Sower. Min. Conch,t. ccclviii.— In Chalk, Lewes.49. A. plicomphala.— Discoid, umbilicate, with eight or ten diverging sharpridges, extending over a part of the sides ;front rounded, plain ; apertureovate. In the young state, the front is ti'ansversely furrowed—Sower. Min.Conch, ccclix. and cccciv—In Sandstone (Middle Oolite ?) Bolingbroke, Lincolnshire.50. A. Smithii Depressed, ribbed and keeled ;inner whorls few, almostwholly exposed ribs ; slightly curved ; keel obtuse ; sides flattened ; apertureoblonir.— Sower. Min. Conch, t. ccccvi.— In Chalk Marl.51. A. striatula.— Discoid, carinated, radiated ; sides of the whorls convex ;the inner whorls exposed; radii numerous, slender, undulated ; surface coveredwith minute stria?, parallel to the radii ; aperture elliptical —Sower.Min. Conch, t. ccccxxi. f. 1 In Marly Limestone, Scarborough.52. A. sulradiata.— Lenticular, umbilicated, carinated, and radiated ; radiitwice curved, obscure, excepting near the margin, where they are bifid ;umbilicus small ; keel entire ; aperture sagittate.— Sower. Min. Conch,ccccxxi. f. 2— Oolite, between Bath and Bristol.53. A. parva.— Discoid; surface marked with diverging, undulating, stria?;inner whorls exposed ; front rounded :aperture oval — Sower. Min. Conch.t. ccccxlix. f. 2 Tunbridge.54. A. Iceviuscula.— Discoid, carinated, umbilicated, obscurely radiated ; carinadistinct ; radii waved, alternately long and short, slightly elevated ; umbilicussmall, exposing part ot the inner whorls ; aperture sagittate.— Sou-er.Min. Conch, t. ccccli. f. 1. 2—In Oolite, Dundry.55. A. corrugata.— Discoid, carinated and umbilicated, strongly radiated ;carina distinct ;radii waved, sometimes furcated, elevated ; umbilicus broad,exposing parts of the inner whorls ;aperture obovate ;front obtuse.— Sower.Min. Conch, t. ccccli. f. 3.— In Oolite, Dundry.56. A. Turneri— Depressed, radiated, carinated, a furrow on each side ofthe keel ; inner whorls exposed ; radii numerous, equal, curved towards thefront ;aperture oblong, quadrangular.— Sower. Min. Conch, t. cccclii.—InLias, Wymondham Abbey and Walchet.*** Whorls knobbed.57. A. nodosa— Depressed, keeled, ribs straightfor two-thirds of theirlength, then rising into a small knob, from which they extend towards thekeel, curving upwards, rather distant, with a gentle concavity between them;