NATURAL SCIENCES OP PHILADELPHIA 109 



July Wth. 

 Mr. Cassin, Vice President, in the Chair. 



Thirteen members present. 



The resignation of Dr. B H. Rand, as Recording Secretary, was read. 



The following papers were read and referred to a committee : 



11 Remarks oo the genus Taxocrinus, &c, with descriptions of new 

 species,'! and " Descriptions of new species of Crinoidea, &c." By 

 F. B. Meek and A. H. Worthen. 



The deaths of Joseph Hopkinson, M. D., Mr James Dundas, Mr. J. 

 Reese Fry, and Mr. Richard Price, late members, were announced. 



July \%tli. 



Mr. Cassin, Vice President, in the Chair. 



Eleven members present. 



The following paper was read and referred to a committee : 



" On Amphibamus grandicep3, &c." By Prof. E. D. Cope. 



July 25th. 



Mr. Cassin, Vice President, in the Chair. 



Nine members present. 



On Report of the respective Committees, the following papers were 

 ordered to be published. 



Descriptions of New Species of FOSSILS, from the Marshall Group of Michi- 

 gan, and its supposed equivalent, in other States; with Notes on some 

 Fossils of the same age previously described. 



BY PROFESSOR ALEXANDER WINCHELL. 



The following paper is intended to constitute a further contribution to our 

 knowledge of certain western rocks occupying a position near the boundary 

 line between the carboniferous and Devonian systems.* The materials for 

 this paper have been in part collected by the writer in Michigan, Ohio, Indi- 

 ana, and towa. Further material has been found amongst the inrestigandu 

 of the " White Collection " of the University of Michigan. Col. Charles Whit- 

 tlesey's collection of fossils from the "Fine Grained Sandstone " of Ohio, has 

 also been placed in the writer's hands for study. In addition to this, the lat- 

 ter has spent several days with Prof. James Hall in .his cabinet, engaged in 

 making direct comparisons between the fossils of the rocks under considera- 

 tion, and the types of the Chemung group, preserved in his magnificent col- 

 lection. An opportunity has also been enjoyed of making a hasty survey of 

 the fossils from the same horizon, contained in the extensive collection of the 

 Illinois Geological Survey, for which the writer's acknowledgments are due to 

 the Director, A. H. Worthen, Esq. 



The reader will observe that all the identifications heretofore made with 

 typical Chemung fossils from New York and Pennsylvania, have been aban- 



nial 

 352 



* Former papers by the writer, cm the same subject, may be referred to as follows : " First Bien- 

 al Report" of the Geological Survey of Mich. I860; Amer. Jour. Sci. and Arte, [2J Vol. xxxiii. p. 

 i2; ib. [2] xxxv. p. 61 ; Proe. Aeal. Nat. Sci. Phil., Sept. 1862, p. 405 ; ib. Jan. 1863, p 2. 



1865.] 



