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 Linne. 

 Mya trimcata, L. S. N. p. 1112, 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 Beltr^mieux and others, and the Adriatic on that of G. v. 

 Martens and of Danieli and Sandri. The variety Uddeval- 

 lensis or ahhreviala 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 Udde- 

 vallensis. 



Gastropoda. 



Trochus unibilicalis, Broderip and Sowerby. 



Margarita umhilicalis^ Brod. & Sow. in Zool. Journ. vol. iv. p. 371 

 (1829). 



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



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

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

 Ann. Nat. Hist, for March 1877, p. 237. 



TricJiotropis horealis, 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 ' Exp., 530 fms. : 'Valorous ' Exp., 57-175 fms.: 

 Arctic Exp., 55 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. 



