APPENDIX. 309 



This, more than any other shell, tends to connect the 

 Spitzbergen formation with surrounding districts. Sp. 

 Keilhavii was described in the Berlin Trans, for May 

 1846. The specimens were brought home by Keilhau, 

 from the rocks of Bear Island in 74° 30' N. lat., half- 

 way between Norway and Spitzbergen. In the same 

 paper Von Buch notices that the locality of Bell Sound 

 had been visited by French naturalists (M. Robert and 

 the Scientific Commission which explored these seas in 

 1839), and that the same Producti and Spirifer ( S. 

 Keilhavii) were found there which occurred at Bear 

 Island. And, inasmuch as the Producti are the com- 

 mon British species P. giyanteus and P. Cora, there can 

 be no doubt whatever of the formation to which Spirifer 

 Keilhavii belongs. Count Keyserling described a variety 

 of it from Petschora Land, under another name ; and in 

 the Appendix to Belcher's " Last of the Arctic Voyages ^' 

 I have figured and described this shell from the Carbo- 

 niferous rocks of North Albert Land — Captain Belcher's 

 furthest point. Numerous Producti occurred with it, two 

 of which, if not more, are identical with the Spitzbergen 

 species. I notice this more particularly, because 

 in two communications to the Royal Academy of Brus- 

 sels (Bulletin, vols. xiii. and xvi.) Prof, de Koninck has 

 described the Bell Sound fossils as Permian, and not 

 Carboniferous species, and has given figures of several 

 of them. In a short resume of the Arctic Geology read 

 by myself to the British Association, 1855, I have used 

 this fact as illustrative of the regularity of the Great 

 Arctic basin of palaeozoic rocks (Trans. Sect. p. 211). 



One species only which appears to me of Permian 

 date occurs in a loose block (without definite locality) 

 and will be presently noticed. It would be somewhat 



