168 Description of some Nctv Species of Shells. 



Cardium setosum. Plate XI. fig. 1, a. b. c. — My Cabinet. Cab- 

 inets of Dr. J. C. Jay, and C. M. Wheatlcy. 



C. testa cordata, rotundato-ovata, tumida, subcquilaterali, albido- 

 lutescente, umbonibus albidis ; costis quadraginta planulatis, se- 

 tigeris ; marginibus dentatis : intus Candida. 



Shell cordate, nearly equilateral ; a littlo obliquely rounded 

 ovate, somewhat tumid ; anterior* side shortest, beaks prominent, 

 inflected and nearly in contact; in front of them is a rather narrow 

 ovate depression. On each valve are about 40 flattened radiating 

 ribs, which are twice as wide as the intervening furrows. The 

 edges of these ribs arc very minutely denticulate, and in young in- 

 dividuals the denticulations of adjacent ribs approximate so closely 

 as to give the intervening furrow a punctate appearance; upon the 

 central line of each rib, there is a series of small semi-tubular 

 spines or scales, which when perfect terminate in blackish bristles ; 

 these are more strongly developed on the posterior margin than 

 elsewhere. The ribs which cross the anterior lunular depression 

 are not bristly, but tubercular. Color yellowish white, becoming 

 pure white towards the beaks ; the shell is covered with a thin ep- 

 idermis of dirty yellow, which becomes thicker and much wrinkled 

 towards the margin, especially upon the posterior end, where its 

 color is nearly black. Interior pure white ; grooves answering to 

 the ribs without are faintly visible within, and the edges are strong- 

 ly notched : length, 2.75 inches, height, 2.75 inches, breadth, 2.1 

 inches. 



Habitat, Peas of China. 



Remarks. — This fine shell cannot be referred to any of the 

 species figured and described in Reeve's monograph of this genus, 

 whence I infer it to be new. The number of its ribs, taken in con- 

 nection with their peculiarly bristly character, will distinguish it from 

 the C. asiaticum, C. multispinosum, and other muricated species. 



* I use the terras anterior and posterior in the sense generally adopted by 

 modem authors, being the reverse of that employed by Lamarck. 



