440 PROCEEDINGS OE IHE GEOLOGICAL SOCIETY. [Mar. 28, 



across, without any definite hinge-line, and with very strong ventral 

 muscular impressions. The shell is much depressed. 



2. Productus costatus, Sowerby, very large, and deeply bilobed. — 

 Abundant. 



3. Productus, the large striate species above mentioned. 



4. P. Humboldtii, D'Orbigny, two or three specimens. 



5. P. mammatus, Keyserling ?, or an allied species, without large 

 scattered spines. This species occurs in Arctic America, having 

 been brought by Capt. Belcher from the point opposite Exmouth 

 Island. It is the P. Leplayii of De Koninck's paper on the Fossils 

 from Spitzbergen, but not, I think, of De Yerneuil, who described 

 that species in ' Eussia in Europe.' 



Von Buch quotes the Productus giganteus from the South Cape 

 and from Bell Sound ; this is not noticed at all in Prof. Koninck's 

 list (1849, op. cit. p. 633). 



6. Camarophoria, a large species, not unlike in shape to the 

 Bhynchonella acuminata of the Carboniferous limestone, but ribbed 

 throughout. 



7. Spirifer Keilhavii, Von Buch. Several specimens. 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 common British species P. giganteus 

 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 Carboniferous 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 Brussels (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 palseozoic 

 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 remarkable if all the specimens brought home 

 by M. Robert should prove to be Permian, while those from the same 

 locality before us are mostly of Carboniferous type. The larger and 

 more conspicuous shells do not seem to have been met with by 

 M. Robert in his voyage. 



