400 Miscellanies. 



ken in view of such equivalents, and set forth in the last edition of 

 my Text Book, by the additional collections of organized remains, 

 made in the months of August, September, and October, of the 

 present year, by the students and assistant teachers of this school. 

 At the same time I reviewed the Helderberg range, and continued 

 my examinations throughout the southern part of the county of Al- 

 bany. In truth, every step I take, where organized remains are 

 found, and every specimen brought into this school, (several thou- 

 sands have already been seen in the students' lecture rooms,) strength- 

 en my confidence in the opinion of Cuvier, and of the other great 

 men of the East, that " organized remans are true indexes to geologi- 

 cal strata." 



The following species, found in connexion with Pennsylvania coal 

 beds of Wilkesbarre, Carbondale, &i.c. by Mr. Hall, myself, and stu- 

 dents, have been determined according to M. Brongniart ; and they 

 are all open to the inspection of the amateurs of natural science, in 

 the natural history room of this school. 



Genus Neuroptebis. — Flexuosa, gigantea, heterophylla, ele- 

 gans, Loshii, Cistii, Lorettii, angustifolia, acutifolia, macrophyllai 

 tenuifolia, auriculata, cordata. 



Gemjfs Sphenopteris. — Latifolia, furcata, irifoliata, ariemisae- 

 folia, J\lanteUi, Williamsonis. 



Genus Odontopteris. — Crenulata, Sclotheimii. 



Genus Taeniopteris. — Vittata% 



Genus Cycloptebis. — Ohliqua. 



We have several additional species not determined. 



JVote. — I hope to be able to furnish the Journal with a description 

 of the most important remains, in the collections deposited at this 

 school, accompanied with figures. I have about sixty species already 

 lithographed. Amos Eaton. 



Rensselaer Institute, Troy, N. Y. Dec. 1, 1832. 



4. Correction of an error in Prof. Green's Monograph ofJYorth 

 American Trilohites ; with additional explanations. — I gave Prof. 

 Green several proof sheets of my Geological Text Book, while it 

 was in the press ; in which the genus Brongniartia was erroneously 

 printed, Brongniatia. As Mr. G. has adopted the erroneous printing, 

 it is proper to correct the mistake j as it is the name of a new ge- 



