68 CO}iCEYUA~DITHYRA. 23, 



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



Gmelin. Syst, p. 3259. 



Turton, Linn. Syst. iv. p. 21 1. 



Pmnrmt, Brit. Zool. iv. p. 193, tab. 55, fig. 2. 



Chemnitz, vi. p. 230, tab 23, fig. 229, 230. 



Donovan, British Shells, ii. tab. 61. 



Montagu, Test. Brit. p. 92. 



Linn. Trans, viii. p. 70. 



Turton, British Fauna, p. 154. 



Dorset Catal. ]>• 32, tab. 6. fig. 6. 



Dillwyn, Descript. Catal. p. 140. 



Turton, Conch. Diet. p. 81. 

 Trigonella Gallina. Da Costa, p. 199, tab. 14, fig. 6. 

 Mus. nost. On most sandy coasts. 



Shell an inch and a half long and two inches broad, strong and 

 solid, nearly smooth or with a few antiquated ridges, equally slop- 

 ing obliquely at the sides, so as to make the front margin longer 

 than the lateral angles : color yellowish-white, often marked with 

 deeper transverse zones. 



truncata. Mactra testd trigond Iceviusculd wuiluterali, luterihus truncatis, 

 umbonibus productis rectis. 

 Shell triangular nearly smooth and equilateral, with the sides trun- 

 cated, and the beaks elongated and straight. 

 Mactra truncata. Montagu, Test. Brit. Su^jpl. p. 34. 



Pennant, Brit. Zool. iv. p. 196, tab. 54, fig. 1. 

 Dorset Catal. p. 34, tab. 12, fig. I. 



