Fig. 



gaditana, Listen,- compressa. — Scarborough, Southend, Swansea, 

 Cork, Clyde, C. Broad, compressed. 



Donax. 



19. D. anatinus, Land. — D. trunculus, Linn.?, Cuneus vittatus, D. 



ruber (young). — Brit. co. generally, sandy shores, C. Broad; 

 margin crenulated. 



20. D. politus, Poci. — (Tellina) D. and Capsa complanata. — S. Devon, 



Bantry Bay, etc., Mr. Smooth ; inner edge not crenated. 



Mactra. Lives on sandy beaches. 



21. M. STULTORTJM, Linn. — (Cardium) Tellina radiata, Trigonella r., 31. 



cinerea, M. magna. — British co. generally, C. 



22. M. elliptica, Brown. — British co. generally, C. Oval. 



23. M. subtruncata, Costa. — 31. lactea, 31. triangula, 31. crassatella. 



— Brit. co. generally, C. Obliquely cuneiform. 



24. M. helvacea, Chemii. — 31. glauca, M. neapolitana. — Odd valves 



found dead in Cornwall, R. Large, obliquely oval. 



25. M. solida, Linn. — Trigonella zonaria and gallina. — Brit. co. ge- 



nerally, C. Trigonal, thick. 



26. M. TRUNCATA, Mont. — Forth, Cork, Cornwall, etc., C. Trigonal, 



deep, thick. 



