PLATE III. 



Psammobia. Inhabits sand and mud. 

 Fig. 



1. P. ferroensis, Chemn. — {Tettina) T. incarnata, T. radiata, T. 



trifasciata, T. truncata. — Brit. co. generally ; coralline, C. 

 Oblong, keeled and angulated behind. 



2. P. costulata, Turt. — P. discors. — Torbay, Cornwall, Skye, etc., R. 



Ribbed behind. 



3. P. Tellinella, Lamk. — P. fiorida. — Exmouth, Guernsey, Tenby, 



Bantry B., Oban, Zetland, etc., 5 to 50 fath., C. Oval, smooth. 



4. P. Vespertina, Chemn. — {Lux V.) Solen, Sanguinolaria V., Tettina 



depressa, variabilis. — Weymouth, Scarborough, Tenby, Bantry,. 

 etc., Guernsey, C. Not angular nor keeled behind. 



Tellina. 



5. T. crassa, Penn. — T. maculata, T. rigida. — S. Devon, Guernsey, 



Man, Tenby, Bantry, Forth, etc., low- water to 15 fath., C. 

 Thick, orbicular. 



6. T. bala.ustina, Linn. — Birterbuy, Skye, Exmouth, Rr. as British. 



7. T. donacina, Linn. — T. trifasciata, T. variegata, T. Llantivyi. — 



Various British loc, and S. Europe, 5 to 50 fath., C. Wedge- 

 shaped. 



8. 9. T. proxima, Brown. — Var. T. calcarea (9), T. ovalis, T. sordida, 



Sanguinolaria sordida, Macroma tenera. — Skye, etc., R. 

 10, 11. T. pygm^ea, Phil. — Devon, Cork, Shetland, etc., 8 to 50 fath., 



C. Smaller, more convex, and more truncate than T. donacina. 

 12, 13. T. tenuis, Da Costa. — T. planata, T. polita, T. exigua. — On 



sanely shores, in various localities, C. Flat, thin. 



14. T. incarnata, Linn. — T. squalida, T. depressa. — Devon, Bantry, 



Tenby, R. Flat, beaked. 



15. T. solidula, Putt. — T. rubra, Da Costa, T. carnaria, T. zonata, 



Psammobia solidula, T. Balthica. — All British coasts ; littoral, 

 C. Thick, inflated. 



16. T. fabula, Gronovius. — T. discors. — On sandy shores generally, C. 



Valve with oblique striae (omitted by error). 



Ervillia. 



17. E. castanea, Mont.— {Bonax) Mesodesma c, Capsa c. — Cornwall 



and Scilly Isles, R. Ligament within. 



SCROBICULARIA. 



1 8. S. piperita, Gmel. — Generic syn. : Mya, Venus, Trigonella, Mactra, 



Lutraria, Listera. — Specific syn. : hispanica, borealis, plana, 



