Pandora.
02. P. rostrata, Lamk.—Tellina inæquivalvis, Linn.; P. margaritacea and inæquivalvis.—S. Devon?, Guernsey, R. as Brit. Valves long.
03. P. obtusa, Leach.—Solen Pinna, Mont.—S. Devon, Dorset, Mc. Ire., R. Valves short and broad.
Lyonsia. With byssal attachment.
04. L. norvegica, 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.
05. T. distorta, Mont.—(Mya) Anatina and Amphidesma d., Th. truncata.—Distribution general, but not common. Short, truncated, irregular.
06. T. convexa, Wood.—(Mya) Anatina and Amphidesma c., T. declivis.—S. Devon, Bantry Bay, Arran, etc., Mc. Inflated.
07. T. phaseolina, Lamk.—Amphidesma p., T. declivis.—Various localities and depths, C. Oval, obliquely truncated.
08. T. pubescens, Pult.—(Mya) Anatina and Amphidesma p., T. declivis.—S. Devon, Cornwall, Belfast, etc., C. Oblong, straightly truncated.