CONCHYLIA— D/TifFB^. 41. 181 



Montagu, Test. Brit.p. 77. 



Linn. Trans, viii. p. 62. 



Turton, British Fauna, p. 152. 



Wood, Conch, p. 207, tab 51, fig. 1. 



Dillwyn, Descript. Catal. p. 115. 



Turton, Conch. Diet. p. 28. 



Chemnitz, vi. p. 161, tab. 15, fig. 155, 156. 

 Cardium spinosum. Sowerby, Brit. Miscell. tab. 32. Younger. 

 Pectunculus magnus. Lister, Conch, tab. 321, fig. 158. 

 Mus. nost. On the western coasts . 



Shell nearly four inches broad, very tumid, light in comjiarison 

 with its size, with about 21 ribs ; those on the cartilage side clothed 

 with a row of long sharp spines, which are lancet-shaped in the 

 half grown and young shells, and round in the aged ones ; those on 

 the opposite side furnished with rather flattened obtuse tubercles ; 

 the grooves between them closely and regularly striate transversely, 

 but these striae do nqt extend across the ribs : the anterior side pro- 

 jecting a little under the beaks, so as to form a small angle, from 

 which it extends in a nearly straight line, and where it gapes : in- 

 side white or tinged with purple, with the ribs continuing the whole 

 length of the shell. 



The individual represented in our plate, and which we dredged in 

 Torbay, is remarkable for its oblique outline, and the singularity of 

 the primary teeth, all of which are deeply cloven. 



Cardium testa suhglohosd solidd, antic^ subtruncatd, costis 21, anft'm tuberculatum 

 tuberculatis posticis subsquamosis sulcisque rugosostriatis. 



