PREFACE. 
•via 
explanation is due. The works of more especial interest, which have come 
to hand in the interval, are : 
Graptolites de Boheme. By J. Barrande. 
A paper on Stephanocrinus. By Dr. F. Rcemer. 
A paper on Brachiopoda. By M. de Yerneuil and Mr. Davidson. 
Monographic des Polipiers fossiles des Terrains palseozoiques. By Milne-Edwards and 
Jules Haime. 
British Palaeozoic Rocks and Fossils : Part ii. By Sedgwick and M‘Cor. 
Die Versteinerungen der Grauwacken Formation in Sachsen, &c. Yon Hans Bruno Geinitz. 
Heft 1 : Graptolithen. 
In the progress of this volume, I have been indebted to numerous friends 
for specimens of fossils, communicated to me for illustrating the work. In 
all such cases, suitable credit has been given at the close of the description 
of the fossil. I am, however, more especially under obligation to Col. E. 
Jewett, formerly of Lockport, now of Utica, for many unique specimens, 
particularly among the crinoids. I am likewise indebted to Dr. Worcester, 
of Lockport, for several specimens in the Clinton and Niagara groups, and 
to Mr. Gebhard for a large proportion of those from the Coralline limestone. 
I would also express my obligations to Mr. John Paterson, under whose 
supervision the volume has passed through the press. 
