VUl PREFACE. 



explanation' is due. The works of more especial interest, which have come 

 to hand in the interval, are : 



GraptoUtes de Boheme. By J. Barrande. 



A paper on Stephanocrinus. By Dr. F. Rcemer. 



A paper on Brachiopoda. By M. de Verneuil and Mr. Davidson. 



Monographie des Polipiers fossiles des Terrains palsseozoiques. By Milne-Edwards and 



Jules Haime. 

 British Palseozoic Rocks and Fossils : Part ii. By Sedgwick ^nd M'CoT. 

 Die Versteinerungen der Grauwacken Formation in Sachsen, &c. Von 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. 



