History of British animals - University of Guam Marine Laboratory

Ammonita. MOLLUSCA. CEPHALOPODA. 24331. A. Herveyi — Gibbose, the inner whorl two-thirds concealed ; ribs numerous,sharp, bi- or tri- furcated ; aperture lunate, with obtuse angles.Sower. Min. Conch, t. cxcv— Under Oolite, near Spalden.32. A. Brocchii— Compressed, sides hollow ; whorls 3 or 4, half concealed,very round, front circular, with many obtuse ridges ; aperture lunate Sower.Min. Conch, t. ccii Under Oolite.33. A. annulata— Depressed, whorls 5 to 7, exposed, rounded ; ribs numerous,prominent, divided on the front ; aperture roundish Sower. Min.Conch, t. ccxxii—In Lias.34. A. Lamberti— Depressed, inner whorls partly concealed, front sharpand crenated ; ribs strong, obtuse, bent over the front, alternately long andshort, rarely 3— furcate; aperture lanceolate, short—Sower. Min. Conch, t. ccxlii.f. 1, 2, Upper Oolite, Weymouth.35. A. Leachii— Depressed ; inner whorls half concealed ; front sharp andcrenated; ribs undulated, curved over the front, often furcate; apertureovate ; like the preceding, but more gibbous, with fewer and more prominentribs—Sower. Min. Conch, t. cclxii. f. 4 Upper Oolite, Weymouth.36. A. omphaloides.—Gibbose, whorls increasing rapidly, inner ones halfconcealed, front rounded, broad ribs ;prominent, waved, bent forward in themiddle of the front, generally furcated ;aperture transversely oblong Soiver.Min. Conch, t. ccxlii. f. 5 Upper Oolite, Weymouth.37- A. Strangewaysi —Discoid ; whorls 5, exposed, margin flattened, carinated; inner edges of the whorls obliquely flattened ; sides nearly flat, wichan obscure concentric furrow ;ribs twice furrowed ; aperture oblong Sower.Min. Conch, t. ccliv. f. 1, 2, 3— Under Oolite, Ilminster.38. A. falcifer.— Discoid ; inner whorls half exposed, margin convex, cari.nated ; inner edge of the turns elevated and obtuse ribs ;numerous, curved,and suddenly bent in the middle ; aperture elliptical—Sower. Min. Conch,t. ccliv. f. 2— Under Oolite, Ilminster.39. A. Goodhalli— Discoid, carinated ; both edges of the whorls graduallyrounded sides ;nearly flat ; inner whorls two-thirds exposed ; ribs large, undulated,irregular, obscurely tuberculated at each end keel ;very prominent,thin ; aperture oblong—Sower. Min. Conch, t. cclv In Green Sand, Blackdown,Devonshire.40. A. Karnigi — Discoid, convex, margin rounded, whorls 6, half exposed,marginal undulations numerous ; central undulations few, very prominent ;aperture cordate, elongated—Sower. Min. Conch, t. cclxiii. f. 1, 2,3 MiddleOolite, Kelloway.41. A. triplicata — Discoid, whorls 5, exposed, with two or three obliquecontractions ; ribs straight, large, each divided into three as it passes overthe rounded front ; aperture suborbicular—Sower. Min. Conch, t. ccxcii.ccxciii. f. 4—Middle Oolite.42. A. biplex — Discoid, whorls 5, exposed, ribs numerous, small, obtuse,split over the rounded front; aperture oblong.— Sower. Min. Conch, t. ccxciii.f. 1, 2—In Clay, but the formation unknown.43. A. rotunda— Discoid, ribs thick, numerous, split over the front, sidessubventricose ;aperture orbicular—Sower. Min. Conch, t. ccxciii. f. 3.—Upper Oolite.44. A. decipiens — Discoid, depressed, whorls 5, exposed, rounded on thefront, ribs large and few on the sides, numerous and small on the front ; apertureorbicular.._5owcr. Min. Conch, t. ccxciv.— In Clay, but the formationunknown.