30 



In its general habits, it certainly appears very nearly 

 allied to the Pholades, but the want of the acceflbry valves 

 forbids its being placed in that clafs : though, if we ad- 

 mit of the exiftence of a tooth, it is the link that connefls 

 the Pholas and My a. This hitherto feems only to have 

 been found at Weymouth, or on the Dorfct coaft, by thofe 

 who have defcribed it. We have found it not uncommon 

 on the DevonJJiire coaft, at Torbay and at Plymouth, 

 burrowed in detached pieces of lime-flone; but always 

 dead fliells, though in good condition. It rarely exceeds 

 three-quarters of an inch in length ; and is frequently 

 tinsjed with rufous-brown. 



Arenaria. Mya Arenaria. Lin. Syft. p. 1112. 



Gmcl SyjLp. 3218. 2. 

 Br. Zool. t, 42. f. 16. 

 Chem. Conch, vi. t. 1. f. 3. 4. 

 Turt. Li?i. iv. p. 175. — Don. Br. Shells. \\\. 

 t. 85. 

 Ciiama Arenaria. Da. Cojla. p. 232. 



M. with an oval fliell, moderately concave, generally 

 of a rugged appearance, but fome are more fmootli with 

 numerous fmall concentric ftrise ; in (uch the fliells are not 

 fo thick and ftrong as in the more rugofe variety : the hinge 

 is not very remote from the centre, but nearelt the larger 

 end : the umbo is rather prominent : one valve furnifned 

 with a broad, thick, ere61: tooth, by which it is joined to 



the 



