72 C0NCHYLIA~-D7T//Fi?^. 23. 



** Denies laterales laves. 6-10. 

 The lateral teeth smooth. 



Stultorum. Mactra testd trigond diaphand convexd nEquilaterali transversim sub- 

 striatd, latere antico rugoso. 

 Shell triangular transparent convex equilateral slightly striate trans- 

 versely, rough on one of the sides. 

 Mactra Stultorum. Linn. Syst. Nat. p. 112G. 



Gmelin, Syst. p. 3258. 



Turton, Linn. Syst. iv. p. 211. 



Pennant, iv. p. 103, tab. 52, fig. 1. 



Chemnitz, vi. p. 226, tab. 23, fig. 224 to 227. 



Montagu, Test. Brit. p. 94. 



Donovan, British Shells, iii. tab. 106. 



Linn. Trans, viii. p. 69. 



Turton, British Fauna, p. 154. 



Dorset Catal. p. 32, tab. 8, fig. 3. 



Dillivyn, Descript. Catal. p 138. 



Turton, Conch. Diet p. 81. 

 Trigonella radiata. Da Costa, p. 196, tab. 12, fig. 3. 

 Mus. nost. On most sandy coasts. 



Shell an inch and a half long, and au inch and three-quarters 

 broad, very thin and brittle, white grey or pale brown, covered with 

 a fine wrinkled skin which is rough at one of the extremities, ra- 

 diate more or less from the hinge with paler stripes, and sometimes 

 of a purplish cast about the beaks, rarely glossy white and without 

 rays. 



