LETTER OF TRANSMITTAL. 
GEOLOGICAL SURVEY OF NEw JERSEY, 
New Brunswick, New Jersey, July 1, 1889. 
Sir: I have the honor herewith to transmit to you the text and draw- 
ings of the Gasteropoda and Cephalopoda of the Raritan Clays and Green- 
sand Marls of New Jersey. They have been prepared by Prof. Robert P. 
Whitfield for the Geological Survey of this State, and include all species 
of this geological division which are known to have been found within its 
bounds. The book will constitute the sécond volume of the series, which 
is intended to include descriptions of all the fossil invertebrates found in 
the above named formations. It is a monument to the patience and intelli- 
gent skill of Prof. Whitfield which have produced so good a work from 
these long known but imperfectly preserved fossils. Like its predecessor, 
I esteem it worthy of a place among the monographs of the United States 
as well as of this State, and as such transmit it to you for publication. 
I am, with high respect, your obedient servant, 
Gro. H. Cook, 
State Geologist of New Jersey. 
Hon. J. W. Powe 1, 
Director of the U. S. Geological Survey. 
