196 DH. C. T. TEECHMA>T OX I2f TEH GLACIAL [vol. lxxV, 



■and Chalk, and throughout the deposit numerous broken shells, 

 some of which show line striations. Except for the presence of 

 Oolitic rocks, the description applies very well to the Durham 

 Scandinavian clay. 



Its present distribution as a living species seems to be entirely 

 American. Sir J. W. Dawson l records it as fossil at Riviere du 

 Loup, Labrador (Packard), and Greenland (Moller), and says that 

 from the first-named locality he only saw an imperfect and decorti- 

 cated young shell. He records the recent shell from the Gulf of 

 -St. Lawrence and the coasts of Nova Scotia and New England. 

 Further records 2 of the recent shell are as follows : — Maine : 

 Casco Bay, at a depth of 5 fathoms ; Massachusetts : Ipswich 

 Bay ; Nahant ; oft' Princetown ; Buzzard's Bay ; Duxbury, etc.. at 

 20 fathoms. I have a recent specimen labelled ' Newfoundland.' 



It is recorded as having been dredged off Jan Mayen towards 

 Greenland, at a depth of 1309 fathoms, having apparently been 

 •dropped from icebergs. 



•Cahdium islaxdiclm Linnaeus. 



Next to Gyprina islandica this is the commonest species in the 

 Durham Scandinavian Drift. Although it generally occurs in 

 fragments, I have succeeded in recovering some perfect valves by 

 collecting the pieces of crushed shells and joining them together 

 again. They are of moderate size, the largest measuring about 

 40 mm. in length. 



It is recorded from Dimlington and Bridlington, but not from 

 the Cromer district. 



Mr. A. Bell informs me that it is recorded with doubt from a 

 Pleistocene deposit at Macclesfield (Cheshire), at 440 feet O.D. 

 >On the opposite side of the Atlantic the species occurs fossil at 

 Riviere du Loup ; Murray Bay ; Portland (Maine), etc., and recent 

 in Greenland and New England. Its range extends from the 

 Arctic Ocean southwards to Cape Hatteras. 3 



•Cardium edule Linnaeus. 



For some years I thought that this species did not occur in the 

 Scandinavian Drift at Warren -House Gill, but I recently found a 

 few valves of it in a portion of the clay that had been uncovered 

 by storms. It is much scarcer in this deposit than C. islandicum. 



1 ' Notes on the Post-Pliocene Geology of Canada ' (Canadian Naturalist, 

 vol. vi) 1872, p. 74. 



2 C. W. Johnson, ' Fauna of New England ' Boston Soc. Nat. Hist. Occ. 

 Papers. No. 13, vol. vii (1915) p. 78. 



3 W. H. DalL Bull. U.S. Nat. Mus. No. 37 (1889) p. 52. 



