APPENDIX. 311 



17. Aviculopecten, and a Spirifer with broad ribs. 



18. Aviculopecten. A large species (looking like the 

 A. papyraceus of our own coal-shales magnified), found 

 in the gravel among the Thousand Isles; it probably 

 came from these beds. 



A weathered block of white limestone, probably from 

 the islands on the south-eastern side of Spitzbergen *, 

 contains the only truly Permian species which I have 

 seen among these specimens, viz. 



19. Spirifer alatus, Schloth., a common fossil of the 

 Zechstein. 



20. ProductuSj a small species. (P. horridus of De 

 Koninck s list, but apparently too deeply lobed.) 



21. Stenopora, a large foliaceous flattened species. 

 Spirifer octoplicatus (cristatus), above mentioned, also 



occurs in similar whitish limestone. These may possibly 

 have all come from the locality whence M. Robert s 

 original specimens were found; but it would appear 

 that they are not by any means the prevailing fossils of 

 the island. 



The general aspect of the fossils is unquestionably 

 Carboniferous ; and some of the species have a wide 

 diffusion. Productus costatus ranges from India to the 

 Mississippi, and P. semireticulatus (which I think is 

 only a variety of the same species) has even a wider 



* With regard to this specimen, I stated, in reply to an inquiry on 

 the subject, &quot;The loose block of white limestone to which you refer as 

 having a Permian aspect was, if I mistake not, picked up on one of 

 the islands to the S.E. of Edge s Land. It is unlike any rock I saw in 

 situ ; and, as it is evidently a travelled block, I think it not improbable 

 that it does not belong to Spitzbergen at all, but may have been trans 

 ported by the drift-ice from Commander Gillies s Land, or some other 

 unknown country to the north-east.&quot; April 21, 1860. J. L. 



