468 PK0CEEDING9 OP THE GEOLOGICAL SOCIETY. [May 20, 



Baie de Chaleurs. The second is also from rocks at Gaspe*, supposed 

 to be Upper Silurian, but below those containing Land-plants. 



§ IV. New York. 



In my paper of last year several species were referred to the 

 Cattskill group, being so labelled in the collection of the Geological 

 Survey of New York. Prof. Hall has, however, communicated to 

 me, and published in the ' Canadian Naturalist,' observations recently 

 made by Mr. Way and others, and confirmed by his own examina- 

 tions, of sections and fossils, which show that the rocks from which 

 these Plants were obtained really belong to the underlying Portage 

 and Chemung groups. This brings the distribution of the Devonian 

 Plants of New York more nearly into harmony with that observed 

 at Gaspe and elsewhere, and leaves the Cattskill group, as now re- 

 stricted, destitute of that evidence of connexion with the underlying 

 beds which these Plants seemed to afford. 



I desire to change the name Pecopteris (Alethopteris) decurrens, 

 of my last paper, into P. discrepansf, — a species from the Coal of 

 Pennsylvania having been described by Lesquereux under the 

 former name. 



§ Y. Conclusion. 



The present paper raises the number of species obtained from the 

 Devonian rocks of Eastern America to about eighty-two, but does not 

 in any respect invalidate the general conclusions stated in my former 

 paper. Of the whole number of species, only two can with certainty 

 be referred to the Lower Devonian, and these also occur higher in 

 the series. Twenty-one are found in the Middle Devonian, and of 

 these nine or ten ascend to the Upper Devonian, which has afforded 

 about sixty-eight species ; and of these probably ten are known in 

 the Carboniferous System. It must be observed, however, that the 

 precise age of the beds at Perry and St. John is uncertain, and that 

 they are referred to the Upper Devonian principally on the evidence 

 of their fossil Plants, — the stratigraphical evidence being sufficient 

 merely to prove their Precarboniferous date. 



EXPLANATION OF PLATES XVII.-XIX. 



Plate XVII. 



Figs. 1 & 2. Portions of pinnas of Lycopodites Richardsoni ; (2 a) leaves 

 enlarged. 



3. Stigmaria pusilla. 



4. Carpolithes ? siliqua. 



* Prof. Hall informs me that he has ascertained the ordinary Fucoides Cauda- 

 galli of New York to be fragments of spiral forms, which he proposes to describe, 

 under a new generic name, in a forthcoming Report of the Regents of the Uni- 

 versity of New York. It is possible that the Gaspe fucoids above noticed may 

 also have been spiral in their growth. 



t This correction has already been made in the list of errata occurring in 

 vol. xviii. of the Society's Journal, and published, together with the title-page 

 and index of that volume, with No. 73 of the Journal. — Edit. 



