History of British animals - University of Guam Marine Laboratory

Cardium. MOLLUSCA. CARDIADiE. 421Linn. Syst.i. 1122. Penn. Brit. Zool. iv. 90. t. 1. f. 37- Don. Brit.Shells, t. vi. Mont. Test. Brit. 77. Turt. Biv. Brit. 180. t. xiii. f. 6,7.— In sandy bays.Length nearly 4 inches ; light in proportion to its size ; ribs rather broad,depressed with a rough or winged middle hue rising into lanceolate spines atthe retral side and compressed tubercles at the opposite, the furrows transverselystriated. The young of this shell is the Cardium ciliare of Linnaeus.432. C. tuberculatum. — Shell tumid, ponderous, with 21ribs, the posterior ones tubercular, the anterior ones scaly, and,together with interstices, rough with wrinkled striae.Linn. Syst.i. 1122. Don. Brit. Shells, t. cvii. f. 2. Mont. Test. Brit.568. Turt. Biv. Brit. 181—Western coast of England ; common inPaignton Sands, Torbay, at low spring tides.Shell nearly the size of the " last. It is more solid and ponderous, of amore globular shape, and running in a nearly straight line on the cartilageside from the beaks ; the ribs are narrower, and the grooves are deeper, bothmarked with strong irregular transverse striae ; the cartilage side is clothedwith rather sharp tubercles, which never extend into spines, and which, atthe opposite side, form thick transverse, scale-like :plates the colour is of adeeper chesnut ; and the ribs on the inside extend only half wav towards thebeaks."—Dr Turton.— 433. C. echlnatum. — Tumid, thin, with 18 ribs, armed withnumerous reflected spines.Pectunculus echinatus, List. An. Ang. 188. Conch, t. cccxxiv C. ech.Linn. Syst. t. 1122. Penn. Brit. Zool. iv. 90. Mont. Test. Brit. 78.Don. Brit. Shells, t. cvii. f. 1. Turt. Biv. Brit. 183 Sandy bays.Less than the two preceding species, and more generally covered withspines • these on the anterior side are large, and curved towards the cartilageside.We have given separate stations to these three reputed species, in deferenceto the authority of preceding authors, rather than from a convictionthat they are distinct. Indeed, judging from specimens, given us by MontaguLeach, and found more by ourselves, we can perceive thatnone of the characters on which the distinctions are founded can be reliedon. The ribs vary from 16 to 21, from nearly smooth to coarsely wrinkled,and the spines from sharp pointed and recurved, to broad and blunt or tubercular.434. C. muricatum.— Shell elongate, slightly compressed;ribs 37, with numerous lateral tubercles.Pectunculus tenuis, List. Conch, t. cccxxii Cardium mur. Linn. Syst.i. 1123.A specimen of this shell, which I owe to the kindness of myColdstream, and which was found by him at Leith, is upwardsfriend Drof an inchand two-tenths in length, and about a tenth less in breadth ; whitish, tingedwith yellow, and blotched with brown ; the ribs are rounded, and the tubercles,especially in the middle of the shell, are seated on the retral sides ; thoseanteally are short, blunt, and on some of the ribs double, the retral ones aremore prominent ; the edge is strong and serrated the inside has a ; yellowstripe from the beak, bordered on each side by a brown one ; the retral sideis brown and opake. We are disposed to consider the C. nodosum of Montaguand Turton as this shell in a young state.