INTRODUCTION. 



The object of the list here given is to place on record the whereabouts 

 of sundry mineralogical and geological materials, which, viewed from a 

 biological standpoint, might, in part at least, be considered as types, 

 since they represent the original materials upon which new names are 

 based and conclusions founded. It is doubtful, however, if the term 

 type can be appropriately used in this connection, and it has, therefore, 

 been wholly eliminated. 



It may be well to state, in this connection, that, in accordance with 

 the law of 1880, there have been transferred to the department from the 

 United States Geological Survey a considerable number of collections 

 representing the work of various investigators in special areas. While 

 in the majority of cases much of this material and the thin sections of 

 the same have been temporarily retained at the Survey for reference 

 purposes, such are nevertheless enumerated here as a matter of record. 

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