42 DONAX. WEDGE-SHELL. 



3. Donax complanata. Flat Wedge-shell 



Lister, pi. 384. f. 227 Montagu, pi. 5. f. 4. 



Shell oblong, smooth, glossy, with often a few faint &* 

 stant transverse striae, but no longitudinal ones : color 

 yellowish or purplish, often covered with a polished skin, 

 with white streaks or spots, and a single broad white lon- 

 gitudinal ray from the beaks to the margin, the edges of 

 which are ferruginous; inside purple, with the margin 

 plain: teeth small; beaks nearer one end: length five 

 eighths of an inch ; breadth an inch and a quarter. 



From D. Trunculus it may be readily distinguished, by 

 the more flattened form, the single white ray, and more 

 especially by the plain and smooth margin. 



Devon, Dorset, and Cornish coasts : very rare. . .. 



4. Donas plebeia. Plebeian Wedge-shell. 



Lister, pi. 389. f. 228 Montagu, pi. 5. f. 2 Dorset Cat. 

 pi. 5, f. 13. 



Shell oblong, somewhat oval, thick, strong, smooth, 

 glossy, with a few distant transverse furrows, dull yellow- 

 ish horn-color, rarely white, with generally two longitu- 

 dinal brown rays from the beaks to the margin; inside 

 glossy and paler, with the margin smooth : beaks near one 

 encj ; teeth remarkably large and strong, with a single la^ 

 teral one : length hardly half an inch; breadth three quar- 

 ters. 



Weymouth, and North Britain : very rare. v. m. 



5. Donas castanea. Chesnut Wedge-shell. 

 Montagu, pi. 17. f. 2. 



Shell strong, glossy, smooth, with a few irregular 

 transverse wrinkles : color chesnut, with a single darker 

 longitudinal ray, curving from the back to the larger end, 

 and dividing each valve into two nearly equal parts, the CXH 

 lor becoming paler towards the posterior end ; inside the 

 same color, with a slight trace of the ray at the margin, 

 which is smooth : beaks obtuse, rather inclining to the 

 longer side, with one of the teetH very large, the other 

 jsmall, without lateral ones. 



It differs from the last, in the obliquity of the teeth, which 

 p.re bent jn a repurved manner anc| are not furnished with, 



