PALEONTOLOGY OF NEW YORK. 



VOLUME VIII, PART I. 



This volume was issued from the press of Charles Van 

 Benthuysen & Sons in July, 1892, and has met with an apprecia- 

 tive and cordial reception from students of Palaeontology and 

 Geology everywhere. As indicated by its title it purports to be 

 "An Introduction of the Study of the Genera of the Palaeozoic 

 Brachiopoda," and its scope is therefore somewhat broader than 

 that of previous volumes of this series, which had to deal mainly 

 with the presentation of the various palseozoic faunas of 'New 

 York in their order of geological sequence or in their biological 

 relations. The work contains xvi — 367 pages of text, accom- 

 panied by 42 lithographic and 2 photolithographic plates. The 

 purpose of the work is to give accurate diagnosis and illustra- 

 tions of each genus with extended bibliography and synonymy, 

 and various observations on structure, affinities and distribution. 



The history and plan of the work are set forth in the following 

 manner in the preface : 



The completion of the present volume is a partial fulfillment 

 of a promise made at the close of Yolume lY of the Palaeontology 

 of New York, in 1867. The work is presented to the student 

 with a hope that it may prove a useful contribution to science 

 and a helpful guide in the study of that most abundant and most 

 important class of Palaeozoic fossils, the Brachiopoda. Originally 

 intended to form a supplementary part of Yolume lY, the sub- 

 ject has expanded to such an extent that two volumes will be 

 required to present the results with a reasonable degree of com- 

 pleteness ; and even with this addition some very important 

 matter, as the microscopic shell structure, originally intended for 

 the work, will have to be omitted from these volumes. 



The study of the Brachiopoda made necessary in the prepara- 

 tion of Yolumes III and lY, and more especially in the latter, 



