9Q 



This new fpecies wa? firil difcovered by Mr. Soys at 

 Sandwich, who favoured us with feveral fpecimens : we 

 have fince found it, rarely in fand, from Salcomb bay, and 

 Biddcford bay in Devonjhire ; and alfoon Studland beach, m 

 DorfctJJiire,hn\. none fo large asthofe on the KcntiJJi coaii. 



M. with a ftrong, fub-triangular, opaque, white (liell ; Triangularis, 

 zcmbo prominent, obtufe; fides a little unequal: hinge Tab. 3. f 5. 

 llrong; primary tooth iji one valve large, bifid; in the 

 other two fmall teeth, with a triangular cavity between ; 

 lateral ones deprefled. Infide white, not very gloffy, 

 margin ftrongly crenated. Length one eighth of an inch; 

 breadth rather lefs. 



There are no perceptible ftriae on this fhell, yet it has 

 very little glofs. The hinge does not ftriftly correfpond 

 with the charaflers of the genus, but we could not with 

 more propriety place it elfewhere. It is a fingular fliell, 

 and cannot be confounded for the young of any other 

 fpecies. 



We have found it in fand from Falmouth harbour alive, 

 but not common ; and more plentiful, in fand, on various 

 parts of the coaft of South Devon. 



Madra lutrarla. Z/>;. Syji. p.ll26.—G!neL SyjI. p.3259. 14. Lutraria. 

 C/iem. Conch, vi. t. 24. f. 240. 241, 

 Lifi. Con. t.415. i.259.—Id. Ang. t.4. f.l9. 

 Br. Zocl. t.52. f44. 



O 2 Maflra 



