186 



CO^CnYLlA—DITHYKA. 41. 



tiodosum. Cardium testa orbicular i depressmscula, costis 26, ttiberculis 

 titimerosis ohtusis. 

 Shell orbicular and rather flat, with 26 ribs armed with numerous 

 obtuse tubercles. 



Tab. nost. 13. fig. 9. 

 Cardium nodosum, Montagu, Test. Brit. p. 81. 

 Liinn. Trans, viii. p. 66. 

 Turton, British Fauna, p. lo3. 

 Pennant, British Zool. iv. p. 189. 

 Wood, Conch, p. 212. 

 Mus. nosf. Dredged in Torbay. 



Shell hardly half an inch long, and a very little more in breadth, 

 brown or whitish, very slightly angular at the anterior side, with 

 about 26 close-set rounded ribs thickly clothed with obtuse round 

 tubercles, which on the anterior side project into very short 

 spines : beaks central : inside white, with generally a chesnut 

 stripe on the anterior side of the hinge reaching half way down 

 the shell ; the margin strongly serrate. 



It has much the appearance of the young of the Cardium edule, 

 but is distinguished by its rounded and tubercled ribs ; and from . 

 the young of Cardium tuberculatum. in being flatter, with the 

 tubercles not nearly so much raised. Like the next species, the 

 old shells lose the tubercles and become wrinkled or scaly all over. 



cxiguum. Cardium testa tumidd subtrigond, antiee subtruncatd, costis. 

 20 tuberculatis, sulcis transversim striatis. 

 Shell tumid and nearly triangular, somewhat truncate at the 



