of Grinnell Land and North Greenland. 489 



This list of stations where Post-tertiary deposits in Grin- 

 nell Land and North Greenland were examined might be 

 indefinitely increased ; but I think sufficient has been adduced 

 to show that these deposits received careful and systematic 

 investigation. The paucity of the fossil molluscan fauna in 

 species, as compared with individuals, must be accounted for, 

 not by " the difficult circumstances under which the speci- 

 mens were collected in such very high latitudes "*, but from 

 physical causes, a demonstration of which 1 have attempted 

 in a paper I lately contributed to a contemporary magazinef. 

 I am indebted to Dr. Gwyn Jeffreys for the determination of 

 the additional species of Post-tertiary fossil Mollusca included 

 in this paper, and for a revision of the others. 



Note. By J. Gwyn Jeffreys, LL.D., F.R.S. 



Since the publication, in the 'Annals ' for Sept. 1877, of my 

 paper on the Post-tertiary and recent Mollusca procured in the 

 late Arctic Expedition, I have examined more specimens col- 

 lected by Capt. Feilden; and I now subjoin a list, with reference 

 to his additional stations and to some of those previously given 

 by me. 



CONCHIFERA. 

 Pecten Oroenlandicus (page 231). 

 Stations Nos. 20, 21, 22, 24, 26. 



Ledajpernula (p. 232). 



St. No. 9. 



St. Nos. 1,9. 



Leda arctica (p. 238) . 



Axinus Jlexuosus J var. Gouldii (p. 233). 

 St. No. 9. 



Cardium Islandicum, Chemnitz. 



Cardium Islandicum, Chemuitz, Conch. Cab. vol. vi, p. 200, tab 19 

 figs. 195, 196. 



St. No. 13. 



Circumpolar ; frequent in Post-tertiary deposits throughout 

 the north of Europe and America. 



* Ann. & Mag. Nat. Hist., Sept. 1877, p. 230. 

 t Zoologist, 1877, pp. 435-440. 



