4 LETTER OF TRANSMISSION. 



examination of the collections has shown that a few others are also new. 

 Descriptions of these form a part of the present report, with which they will 

 be published for the first time. The whole number of species recognized in 

 the collections and described or noticed in this report is one hundred and 

 eighty-two, of which fifty species were new. 



As I have not been personally engaged in any of the field-explorations, 

 my report is necessarily a paleontological one only, confined to a zoological 

 description and classification of the invertebrate fossils, a reference of them 

 to geological periods already well established, and a discussion of the char- 

 acter of the evidence afforded by the fossils upon which such reference is 

 made. 



My especial acknowledgments are due to those able paleontologists, 

 Messrs. F. B. Meek and R. P. Whitfield, for generous counsel and assistance, 

 and to Prof Joseph Henry, Secretary of the Smithsonian Institution, for 

 extending to me freely all the facilities possessed by that Institution to aid 

 me in the woi'k. 



I am, sir, your obedient servant, 



C. A. WHITE. 

 First Lieut. Geo. M. Wheeler, 

 Corps of JEngineers, U. S. Army, 

 In Charge of Geographical Explorations and 

 Surveys West of the One Hundredth Meridian. 



