152 WORMS. TESTACEA. 39. Cardium. 



Donovan t. *\\.f. i. Cliemn. Conch 6. t. n.f. 9.z6.a~d 



Shell half an inch long, an inch broad, white, fub-pellucid, 

 arched along tbe cartilage slope, rounded at the larger end. 



218. T. maculata. Subovul, thickish, decussately striate, 

 with irregular spots. 



Adams Linn. Trans, iri. p. 252 



Shell with the fpots dissimilar in different fpccimens, but per- 

 fectly alike in both valves, 



39. CARDIUM. Cockle. 



219. C. aculeatum. Convex, slightly truncate and pro- 

 duced on one side, with about 21 ribs grooved down 

 the middle and beset towards the margin with strong 

 spines. 



Br. Zool. t. 50. /. 37. Donovan t. 6. Rarbitt t. %.f. 10. 



Shell about 4 inches wide, yellowish-brown with rufous bands or 

 marks, rounded and tuberclcd on the anterior side, a little trun- 

 cate on the other : fpincs increasing in size towards the 

 larger end, 



220. C. spinosum. Convex, tender, abruptly truncate 

 and produced at one end, with 20 prominent ribs 

 armed with long flat sharp spines. 



Sawerby Brit. Miser//, i. tab^z. 



Shell refcmbling C. aculeatum, but is more tender and abruptly 

 truncate, pale rufous : fpints prickly, fomewhat flattened longitu- 

 dinally with the shell, the larger-ones furrowed, those on the nar- 

 row side curved towards the hinge, thoCe of the broader side 

 curved from the hinge. 



221. C. echinatum. Convex, rounded, with about IS 

 carinate ribs beset with numerous close-set convex 

 spines. 



Donovan t. 107. /. i. Da Cvsta t. ^\.f. ?. 



Shell 2 inches and a half wide, differing from C. aculeatnm in 

 l>trng quite rounded and in not having the ribs grooved, and from 

 C. fpinofum in not being truncate raid in having tlve fpines shorter 

 and more obti:fe. 



222. C. ciliare. Orbicular, thin, with about 18 sharp 

 3-sided ribs beset with short flat pointed spines. 



Donovan t. 32. /. 2. Br. Zool. iv. t. 50. /. 39. 



tf/KvY about 3 quarters of an inch long, "brittle, whitish, with flat 



grooves. 



223. C. tiiberculatum. Convex, strong, thick, with about 

 20 obtuse tubercled transversely striate ribs. 



Donovan t. 107. f. 2. Lister. Couch, t. 320. 



Shel! convex, ponderous, generally brown with darker band.?; 

 the ribs fprinkled with a few knobs. 



2^4. C. noilosum. Flat, suborbicular, with 24 ribs co- 

 vered with close-set obtuse tubercles. 



Montague Brit. Shells, p. 81. . 6. 



Shell 3 quarters of an inch wide, reddish-white, strongly toothed 

 on the margin, glossy-white within. 



225. C. l&vigatum. Somewhat oval, strong, with obso- 

 lete longitudinal stria?, and a few transverse wrinkles 

 concealed by a thin cuticle. 



Br. Zcol. t. 51. /. 40. Donov. t. 54. Da Cost. t. 3<f. 6. 

 Shell 2 inches and <t half Jong, a inches broad, flesh-cotaur be* 



