PREFACE. xv 



collection ; to Dr. C. Rominger, of Ann Arbor, Michigan ; to Dr. James Powers, 

 of Lexington, and to Dr. Benjamin Rogers, of Pendleton, Indiana ; to Dr. James 

 Knapp, of Louisville, Kentucky, and to other gentlemen. There are other col- 

 lections within the State of New York which would have helped to elucidate 

 the character and structure of certain forms, and I can only regret that these 

 could not have been placed in my hands for study. 



The collections of the late Ledyard Lincklaen, originally deposited in the 

 State Museum, and subsequently presented to the institution by Mrs. Lincklaen, 

 have afforded some interesting specimens from the Goniatite Limestone of the 

 Marcellus Shale and Hamilton Group. The collections purchased by the State 

 from Mr. John Gebhard, have furnished the greater part of all the .specimens 

 of species coming from Schoharie, and especially those of the Schoharie grit 

 and the Goniatite limestone of that locality. 



December, 1879. 



JAMES HALL. 



