82 LA51EILIBEANCBIATA. 



Genus PHOLADOMYA, G. B. Sowerby, 1824. 

 Genera Rec. Foss. Shells, 1824, no. xix. pi. 37. 



Pholadomya BartonensiSy Edwards (3IS.). 



Horizmi and Locality. 

 Upper Eocene. — Barton Beds. Barton. 



Pholadomya callista, Edwards (MS.). 



Horizon and Locality. 



Upper Eocene. — Barton Beds. Barton. 



Pholadomya cuneata, J. de C. Sowerby, 1844. 



Cardita margaritacea. 



Mineral Conchology, 1821, pi. 297. %. 1. (Sowerby Coll.) 

 Pholadomya cuneata. 



Mineral Concliology, 1844, pi. 630. fig. 4. (Sowerby CoU.) 

 Horizon and Locality. 



Lower Eocene. — Thanet Sands. Pegwell Bay. 



Pholadomya Dixoni, J. de C. Sowerby, 1844. 



Pholadomya Divoni. 



Mineral Conchology, 1844, pi. 630. fig. 2. (Dixon Coll.) 



Horizon and Localities. 



Lower Eocene. — Londoti Clay. Alum Bay (no. 4 Bed) ; Bognor. 



Pholadomya Koninckii, Nyst, 1843. 



Pholadomya Koninckii. 



Mem. Cour. (4to), 1843, vol. xvii. p. 60. 



Quart. Journ. Geol. Soc. 1852, vol. viii. pi. xvi. fig. 4, p. 265. 



Horizons and Localities. 



Lower Eocene. — London Clay. Alum Bay (no. 4 Bed). — Thaitet Satids. 

 Heme Bay. 



Pholadomya margaritacea, J. Sowerby, 1821. 



Cardita margaritacea. 

 Mineral Conchology, 1821, pi. 297. figs. 2, 3. (Sowerby Coll.) 



Pholadomya margaritacea. 



Mineral Oonchology, 1844, pi. 630. fig. 3. 



Horizons and Localities. 



Lower Eocene. — London Clay. Alum Bay (no. 4 Bed) ; Southampton ; 

 Portsmouth; Ilighgate ; Primrose Hill; Brentford. — Thanet Sands. 

 Pegwell Bay. 



Pholadomya transversa, Edwards (MS.). 



Horizon and Locality. 



Lower Eocene. — London Clay. Alum Bay (no. 4 Bed). 



