INTRODUCTION. 



The following catalogue is an alphabetical enumeration of the paleo- 

 botanical specimens in the collections of the U. S. National Museum, 

 which have been used as bases for new genera and species of fossil 

 plants, or for purposes of illustration. It gives the names, authorities, 

 and catalogue numbers of the specimens, together with the localities 

 and geological horizons whence they came, with the proper citations of 

 the publications wherein they were described and figured. Where a 

 species has been subsequently transferred to another genus or species a 

 cross reference is given to the earlier name. 



In a few cases some of the types and illustrations are composite. It 

 has, therefore, been impossible always to distinguish the specimens of a 

 single type, or the specimens that have been used for illustration. In 

 all such cases the numbers of every specimen used by the author in the 

 description of the type (so far as could be determined) are given. 



The material for the catalogue has been compiled by Dr. A. C. Peale, 

 with the cooperation of Mr. David White and Dr. F. H. Knowlton, and 

 the manuscript prepared by Mrs. M. S. F. Jouy and the Misses L,. M. 

 Graves and M. W. Moodey. 



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