PLATE II. 



Poromya. On mud, in deep water. 

 Pig. 



1. P. granulata, Nyst. — P. anatinoides, Forbes. — Skye, R. 



1*. P. subtrigona, Jeffreys. — Shetland, Mr. Minute, posteriorly ex- 

 panded. See PI. IX. 



Pandora. 



2. P. rostrata, Lamk. — Tellina inaquivalvis, Linn. ; P. margaritacea 



and inaquivalvis. — S. Devon ?, Guernsey, R. as Brit. Valves long. 



3. P. obtusa, Leach. — Solen Pinna, Mont. — S. Devon, Dorset, Mc. 



Ire., R. Valves short and broad. 



Lyonsia. "With byssal attachment. 



4. L. norvegtca, Chemn. — Mya and Anatina n., Mya and Anatina 



striata, M. nitida, Lyonsia elongata, Myatella, and Osteodesma. — 

 Tenby, Bantry, Oban, etc., 5 to 80 fath. With movable ossicle 

 on hinge. 



Thracia. Laminarian and Coralline. 



5. T. distorta, Mont. — {Mya) Anatina and Amphidesma d., Th. 



truncata. — Distribution general, but not common. Short, 

 truncated, irregular. 

 G. T. convexa, Wood. — {Mya) Anatina and Amphidesma c, T. de- 

 clivis. — S. Devon, Bantry Bay, Arran, etc., Mc. Inflated. 



7. T. phaseolina, Lamh. — Amphidesma p., T. declivis. — Various 



localities and depths, C. Oval, obliquely truncated. 



8. T. pubescens, Pult. — {Mya) Anatina and Amphidesma p., T. de- 



clivis. — S. Devon, Cornwall, Belfast, etc., C. Oblong, straightly 

 truncated. 



9. T. VILLIOSULCA, Macgillivray. — T. ovata, Brown. — Exmonth, 



Swansea, Bantry Bay, etc. Various depths, Mc. 



Cochlodesma. Laminarian and Coralline. 



10. C. PRjETENUE, Pult. — {Mya) Anatina, Ligula, and Amphidesma pr. 



— Dorset, Devon, Man, Bantry B., Oban, etc., (25 to 60 

 fath.), R. Spoon-shaped process on hinge. 



Ceratisolen. Burrows in sand. 



11. C. legumen, Linn. — {Solen) Psammobia and Solenicurtus I. — Ex- 



mouth, Swansea, Bantry, etc., C. Hinge nearly central. 



