DEDICATION. 



To His Excellency 



DAVID B. HILL, 



Governor of the State of New York . 

 Sir: 



I have the honor to present to your Excellency a new volume of the Natural 

 History of the State, being a continuation of the work on the Palaeontology 

 of the State of New York. 



This volume is chiefly devoted to the description and illustration of the 

 Trilobites and other fossil Crustacea of the Oriskany, Upper Helder- 

 berg, Hamilton, Portage, Chemung and Catskill groups of the New York 

 Geological Series, and comprises about three hundred pages of text and forty- 

 nine quarto plates of illustration with explanatory text. 



Besides the principal subject of the volume there is included some matter 

 supplementary to Volume V, part ii, embracing forty pages of descriptive text, 

 with eighteen plates and explanations. These subjects together comprise the 

 full amount of text and of plates which could be devoted to this volume under 

 the law of 1883, while making a proportionate allowance for the Volume V, 

 part ii, Lamellibranchiata, in two volumes, and Volume VI, already published, 

 and for Volume VIII, upon the Brachiopoda, which is yet to be published. 



The present volume is the seventh of the entire series, and the fourth in 

 order which has been published under the provisions of Chapter 355 of the 

 Laws of 1883, by which it was directed "that the entire work should not 

 extend beyond five bound volumes in addition to those already issued." 



The entire number of species of Crustacea described and illustrated in this 

 volume is one hundred and forty-four, which are included under twenty-eight 



