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 Lincklsen, originally deposited in the 
State Museum, and subsequently presented to the institution by Mrs. Lincklgen, 
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. 
