History of British animals - University of Guam Marine Laboratory

422 MOLLUSCA. CARDIAD^. Cabdium.435. C. elongatum.— Shell, rounded, compressed, with about25 flattened prickly ribs.Mont. Test. Brit. 82. Turt. Biv. Brit. 185. t. xiii. f. 8—Devonshire andZetland.Shell about a quarter of an inch in diameter :produced, and a little angularat the cartilage side ; the spines are broad and thin, corresponding withthe size of the ribs.— 436. C. cxiguum. Shell subtriangular, retrally truncate,with from 20 to 22 tubercled ribs.Pectunculus exiguus, List. Conch, t. cccxvii.— Cardium subcordatum,Walker's Test." Min. 23. t. cxi. £ 83 C. pygmaaum, Don. Brit. Shells,t. xxxii. f. 3—C. ex. Mont. Test. Brit. 82. Turt. Biv. Brit. 187—Various parts of the coast from Devon to Zetland.About half an inch in diameter, transversely striated ;the ribs roundedwith a mesial ridge, the tubercles are short, and somewhat arched.** Ribs armed zoith transverse scales.437. C. edule.— Common Cockle. — Shell somewhat globular,with about 26 ribs, rounded and interruptedlysulcated transversely.Pectunculus vulgaris, List. An. Ang. 189. Conch, t. ccexxxiv.— Cardiumedule, Linn. Syst.i. 1124. Penn. Brit. Zool. iv. 91. t. 1. f. 41.Mont. Test. Brit. t. 76. Don. Brit. Shells, t. exxiv. f. 1, 2. Turt.Biv. Brit. 188 Common in sand, near low water-mark.Diameter about 2 inches, yellowish-white ; nearly equilateral, or producedposteriorly and more — or less rugged by the ;layers of growth. Cockles forma very palatable food, either raw or boiled, and are considered in highestseason in the spring months.438. C. Jasciatum.— Shell slightly compressed with about26 ribs ;those in the middle smooth, the extreme ones scaly.Mont. Test. Brit. Sup. 30. t. xxvii. f. 6. Turt. Biv. Brit. 189—Variousparts of the coast.Diameter |thsof an inch ; nearly equilateral, whitish, with irregular rufousbands ; the ribs are a little flattened ; the thin transverse scales sometimesextend in front along the margin.*** Ribs unarmed.439- C. medium.— Shell subtriangular,truncated retrally,with a prominent line of junction;ribs about 36.Pectunculus subrufus, List. Conch, t. cccxvi—C. med. Linn. Syst.i. 1122.Don. Brit. Shells, I. xxxii. f, 1. Mont. Test. Brit. 83. Turt. Biv.Brit. 189 English coast, rare.Length vipwards of au inch ;yellowish-white, with brown blotches ; ribsflattened, furrows crossed by fine striae. This species is common to the Mediterraneanand AVest Indies. The specimen figured by Donovan from Hartlepool,and another, referred to by Dr Turton, as taken alive at Torquay,are the only instances as yet recorded of its occurrence in our seas.