18 



same, and to agree very nearly with the fossils figured by Witham 

 under the name of Peuce Huttonia. As this particular structure 

 does not appear to have been met with below the Lias, and occurs 

 in that formation, it furnishes another argument in favor of the 

 Jurassic age of all these rocks. 



Prof. Rogers added, that he had not found in the New Red 

 Sandstone of the Connecticut Valley either the Posidonia or 

 Cypris, although he had met with obscure markings which 

 he was inclined to refer to the latter. He had however satis- 

 fied himself that one of the plants, from the vicinity of Green- 

 field, in Massachusetts, was identical with the form in the 

 Virginia coal rocks referred to Lycopodites, and probably L. 

 Williams onis ; and that, among the other very imperfect impres- 

 sions associated with this, was one which he regarded. as the leaf 

 of a Zamites. 



On the whole, therefore. Prof. Rogers concluded that the addi- 

 tional fossils from the coal-bearing rocks of Virginia and North 

 Carolina served to confirm the conclusion of their being of 

 Jurassic date, and that the fossils thus far found in the more 

 western belt, and its extension through Pennsylvania and New 

 Jersey, rendered it proper to remove it from the Trias and place 

 it also in the Jurassic period, a little lower probably than the 

 eastern belt of North Carolina and Virginia ; and there could be 

 little doubt, he thought, that the same conclusion would apply to 

 the New Red Sandstone of the Connecticut Valley. 



January 18, 1854. 



The President in the Chair. 



Prof. Wyman stated, that since he had presented to the 

 Society his observations on the Amhlyopsis spelceus or 

 " blind fish " of the Mammoth Cave of Kentucky, he had, 

 through the kindness of Prof. Agassiz, been furnished with 

 two other specimens, one of which was larger than any he 

 had seen before. 



