History of British animals - University of Guam Marine Laboratory

Cucul.ea. MOLLUSCA. ARCADE. 399beaks; edgeClay.toot lied within—Sower. Min. Conch, t. cclxxvi. f. 3—London5. A. quadrisidcala Twice as wide as long, convex, longitudinally striated ;anterior side truncated, defined by a keel, and marked by four deep furrows;posterior side small, rounded ;marginal sinus large—Sower. Min. Conch, t.cccclxxiii. f. 1.— In Oolite.6. A. pidckra.—Transversely ovate-elongated, depressed, finely striated ;anterior side rather impressed, obliquely truncated ; beaks close—Sower. Min.Conch, t. cccclxxiii. £ 3— In Oolite.7. A. duplicata Transversely ovate-elongated, convex, longitudinally ribbed; ribs sulfated along the middle ; margin toothed ;beaks close.— Soiver.Min. Conch, t. cccclxxiv. f. 1.— In London Clay.8. A. depi-essa Elongated transversely, depressed, marked with elevatedand crenulated stria? ; extremities rounded ;marginal sinus obscure— Sower.Min. Conch, t. cccclxxiv. f. 2.— In Plastic Clay.9. A. tumida.— Transversely elongated, gibbose, costated? Anterior sidepointed ; marginal sinus short, deep ; beaks distant.— Soiver. Min. Conch, t.cccclxxiv. £ 3 In Maynesian Limestone.10. A. cancellata—Twice as wide as long, convex, longitudinally andtransversely sulcated ;anterior side defined by a keel, truncated ; posteriorside rounded ; marginal sinus short, but deep ; beaks nearly close Mart.Derb. t. xliv. f. 7-— Sower. Min. Conch, t. cccclxxiii. f. 2— Carboniferous Limestone.11. A. rostrata.—" Valves equal, scaleniform ; one end of the shell lengthenedinto a straight, smooth, conical rostrum ; the other end short, gibbous,and marked from the beaks to the margin with very neat equal and acutestria? ; the margin in this part of the shell crenulated ; the beaks are small,pointed, and approximate, placed over the shorter extremity.".—Mart. Derb.t. xliv. f. 6.—In Carbo?iiferous Limestme.Gen. CUCULiEA.— Shell subtransverse, ventricose ; hino-ewith numerous small teeth, with from two to five parallelplates ; ligament subexternal ;anterior muscular impressionwith an elevated margin.1. C. glabra.— Rhomboidal, anterior angle obtuse, posterior edge of thefront rounded ;surface covered by fine longitudinal lines, decussated by thelines of growth ; teeth of the hinge deeply striated.—Park. Org. Rem. iii.171. Sower. Min. Conch, t. lxvii.— Green Sand.2. C. decussata.— Transversely ovate ;gibbose, with flattish longitudinalridges ; anterior side angular ; lines beneath the cartilage few—Park. Org.Rem. iii. 171- Sower. Min. Conch, t. ccvi. £ 3, 4—Green Sand.3. C. oblonga.— Transversely oblong, gibbose, longitudinally striated ; anteriorside wedge-shaped ; lines beneath the cartilage numerous— Soiver.Min. Conch, t. ccvi. f. 1 , 2.— Inferior Oolite.4. C. carinala.— Obliquely cuneiform, smooth ; anterior side pointed, anddistinguished by a ridge running up the beak.— Sower. Min. Conch, t. ccvii.£ 1.— In Green Sand.5. C. fibrosa— Obovate, gibbose, with numerous longitudinal elevated striae