186 



coNCHYLiA— D/rnri?^. 41. 



nodosum. 



7. 



exiguum. 

 6. 



Cardium testa orhiculari depressiusculd, costis 26, tuberculis numero- 



sis obtusis. 

 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. 

 Linn. Trans, viii. p. &Q. 

 Turton, British Fauna, p. 153. 

 Pennant, Brit. Zool. iv. p. 189. 

 Wood, Conch, p. 212. 

 Mus. nost. Dredged in Torbay. 



Shell hardly half an inch long, and a very little more iii 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 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. 



Cardium testa, tumidd subtrigond, anticS subtruncatd, costis 20 tuber- 



culatis, sulcis transversim striatis. 

 Shell tumid and nearly triangular, somewhat truncate at the 



