MYA,. GAPER. 10} 



Shell very light and Lritcte, : remarkably Convex, 'strongly 

 angular at the anterior side, covered with an ochraceous 

 skin, under which it is clear white, rather rough on the an- 

 gular side ; inside, yellowish white : hinge with a small 

 oval tooth projecting horizontally : length ahout an inch ; 

 breadth an inch and a half. 



Mr. Wood observes that it is certainly distinct from both - 

 the last, in its great convexity, and comparative lightness. 



Devonshire, and Dublin bay : very rare. v. m. 



7. Mya prestenuis. Spoon-hinge Gaper. 



Montagu, pi. 1. f. 2 Donovan, pi. 1/6 Wood, pi. 24, 

 f. 7 to 9 Dorset Cat. pi. 4. f. 7- 



Shell oval, flat, thin, brittle, semitransparent, slightly 

 and irregularly striate transversely, rounded at both ends, 

 narrowed and rather pointed at one end, a little depressed 

 at the front margin near the smaller end, in consequence 

 of that part being somewhat turned up to form a small 

 gape : color whitish, a little roughened and inclining to 

 brown at the smaller end : beaks small, pointed, nearly 

 central, inclining to one side; inside white but not polished, 

 with two small ribs which run obliquely from the hinge 

 half way down the cartilage side, leaving between them a 

 long triangular glossy iridescent space : hinge with abroad 

 projecting hollow spoon-shaped tooth in each valve, 

 strongly striate concentrically : length an inch ; breadth an 

 inch and a half. 



Montagu, in his figure, has represented the truncated 

 side of Mya declivis, but the tooth is' that of M. prsetenuis. 

 The outline of this shell much resembles that of the Mya 

 areuaria. The figure in the Dorset Catalogue is an exact 

 and beautiful representation ; all the others quoted are in- 

 jMerent. 

 , Western coasts, and Dublin bay. v. v. 



8. Mya distorta. Deformed Gaper. 



Montagu, pi. 1. f. 1. 



Shell somewhat oval, thin, brittle, semitransparent, 

 white , the valves convex, of a rugged and variously dis- 

 torted appearance, and more or less indented at the mar- 

 gin 5 inside white : hinge with a broad somewhat triangu- 

 K. 3 lar 



