CONCiJYLlA—DITHYRA. 14. 45 



Sbell convex oral-oblong, angular, and slightly truncate at tlie 

 anterior end, with the teeth narrow and very entire. 

 Tab. nosf. 4, fig, 1 and 2, 

 Mya convexa. Wood, Conch, p. 92, tab. 18, fig. 1. 



Turton, Conch. Diet. p. 100. 

 Mya declivis. Donovan, British Shells, iii. tab. 82. 



Mns, nost. From Paington sands. 



Shell an inch and a half long, and nearly two and a hailf broad, 

 and an inch and a quarter in height, very convex light and 

 brittle, of a whitish ferruginous color, irregularly striate trans- 

 versely : the spoon-shaped teeth very narrow in proportion to 

 those of the Anatina pubescens, and without the notch on the 

 broader or hinder part : the beaks meet close together at their 

 points. 



Full grown shells are of rare occurrence : the finest which we 

 have seen, exceeding the proportions above described, was found 

 by our young and ardent friend Miss Hill, of Down-house, near 

 Bristol. 



We believe that the large very convex and light shell described 

 by Montagu, in his Suppl. p. 166, under the name of Ligula 

 distorta, as a remarkable specimen of his Mya distorta, was this 

 species He does not notice the teeth, which in every form and 

 variety in the Anatina distorta are projecting horizontally inwards; 

 and placed laterally oblique in all the sizes of growth of the 

 Anatina convexa. 



Anatina iestd depressd ohlongd, latere antico angulalo truncato, 

 dentibus postice emarginatis. 



pubescens. 



