PLATE II. 



PoROMYA. 0)1 mud, in deep water. 



Fig. 



1. P. GRANULATA, Ni/st. — P. anatinoides, Forbes. — Skye, E. 



1*. P. suBTRiGONA, Jeffreijs. — Shetland, Mr. Minute, posteriorly ex- 

 panded. See PI. IX. 



Pandora. 



2. P. rostrata, LamJc. — Tellina itiaquivalvis, 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., E. Valves short and broad. 



Lyonsia. With byssal attachment. 



4. L. NORVEGiCA, Chemn. — 3Ii/a and Anatina n., Mi/a and Anatina 



striata, M. niticla, Lyonsia elongata, Myatella, and Osieodesma. — 

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

 on hinge. 



Thracia. Laminarian and Coralline. 



5. T. DISTORTA, Mont. — {Mya) Anatina and AmpJddesma d., Th. 



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

 truncated, irregular. 



6. T. CONVEXA, Wood. — [Mya) Anatina and Amphidesma c, T. de- 



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



7. T. PHASEOLiNA, Lamk. — Amphidesma j^., T. declivis. — Various 



localities and depths, C. Oval, obliquely truncated. 



8. T. PDBESCENS, 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. — Exmouth, 



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



CocHLODESMA. Laminarian and Coralline. 



10. C. PR^TENUE, Pult. — {Mya) Anatina, Ligula, and Amphidesma pr. 



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

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



Ceratisolen. Burrows in sand. 



11. C. LEGiiMEN, Linn. — {Solen) Psammohia and Solenicurlus I. — Ex- 



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



