that have been made by various conchologists throughout the 
country, acknowledgment of which has been made by Mr. 
Baker in the text. 
A most attractive feature of the publication is the excellent 
work done on the photographs, which was made possible by the 
use of a very valuable camera furnished by Messrs. John 
Wilkinson and Son, and the skillful work of Mr. Thomas 
J. Staley, who photographed the shells and developed the 
negatives. 
Finally, it is again a pleasure to make mention of the pa- 
trons of The Natural History Survey, whose generosity has 
tended so much to its success and to make recognition of the 
arduous labors of Mr. Baker, which have made it possible 
to issue a work which is most creditable to himself and enables 
the Survey to make another contribution to the advancement of 
science. 
