Post-tertiary Fossils and Recent Mollusca. 235 



Fossil. Universally distributed in the fossiliferous " Drifts " 

 and " glacial " beds of Europe (including- Sicily) and N. 

 Asia and America ; also Coralline and Red Crag. Heights 

 0-1360 ft., the last being at Moel Tryfaen. 



Mya truncataj Linnd. 

 Mya truncata, L. S. N. p. 11 12, ed. xii. 



St. No. 4 (Egerton) ; Nos. 5, 6, and 10 (Hart) ; No. 12 

 (Feilden). 



Recent. Seas of Northern Europe, Asia, and America, 

 1. w.-lOO fms. : ' Valorous ' Exp., 3-80 fms. ; fragments, 

 175 fms. : Arctic Exp., 5^-30 fms. (Feilden). The most south- 

 ern localities recorded are the Bay of Biscay on the authority 

 of Beltremieux and others, and the Adriatic on that of G. v. 

 Martens and of Danieli and Sandri. The variety Uddeval- 

 lensis or abhreviata is more especially arctic, although I have 

 dredged it in Belfast Bay and on the coast of Essex. 



Fossil. Every raised beach and sea-bed in Europe, Ice- 

 land, and N. America, from 2 to 1360 ft. : Crimea, subfossil 

 (Siemascho) : Port Kennedy, 100-500 ft. (Walker) : ' Porcu- 

 pine ' Exp., 65 fms. =390 ft. : Norwich, Red, Coralline, and 

 Antwerp Crags. The usual fossil form is the variety TJdde- 

 vallensis. 



Gastkopoda. 



Trochus umhilicalis, Broderip and Sowerby. 



Margarita umhilicalis, Brod. & Sow. in Zool. Joum. vol. iv. p. 371 

 (1829). 



St. No. 1 (Moss) ; No. 3 (Feilden). 



Recent. Arctic Seas (Parry and others) : ' Valorous ' 

 Exp. 20 fms. : Arctic Exp., 5.^-15 fms. (Feilden). See also 

 Ann. Nat. Hist, for March ISfZ, p. 237. 



Trichotropis borealis, Broderip and Sowerby. 

 Trichotropis borealis, Brod. & Sow. in Zool. Journ. vol. iv. p. 395. 



St. No. 3 (Feilden). 



Recent. Arctic Seas in both hemispheres, Sitcha Isle, 

 Iceland, Faroe I., Norway, Dogger Bank, Scotland, and 

 Ireland, U. S. America, Canada, and Labrador, 5-150 fms. : 

 ' Lightning' !Kxp.,530 fms. : 'Valorous ' Exp., 57-175 fms.: 

 Arctic Exp., 5^ fms., and Dumbbell Harbour (Feilden). 



Fossil. Bridlington, Moel Tryfaen (1330-1360 ft.), Wex- 

 ford, Scotland, Norway (0-80 ft.), Sweden, Canada, and 

 Labrador : Coralline Crag;. 



