INTRODUCTION. 



The list of + ypes, cotypes, paratypes, and figured specimens (plesio- 

 types) of vertebrate fossils here given was begun under the direction of 

 Mr. F. A. L,ucas while acting curator of the section of vertebrate paleon- 

 tology, and has been revised and brought to completion by Messrs. J. 

 W. Gidley and C. W. Gilmore, assisted by Mrs. M. S. F. Jouy and Miss 

 M. W. Moodey. 



It can not be claimed that the list is absolutely complete, for the reason 

 that much material still remains in boxes in storage. The withdrawal of 

 Mr. IyUcas from the Museum seems to render advisable the publication 

 of the catalogue at this time. 



The arrangement, as in the case of the invertebrate section, is alpha- 

 betical, and in each case is given a brief description of the specimen, 

 horizon, locality, the place and date of publication, and the synonymy. 



As will be noted, there are represented types (and cotypes) of some 

 385 species, many of which are of great value, since they were obtained 

 by the early explorers, including Evans, Hay den, Cope, and Marsh, and 

 comprise many of the types on which Leidy, Cope, and Marsh founded 

 much of their early work in vertebrate paleontology. The material was 

 obtained mainly under the auspices of the various United States geo- 

 logical surveys and exploring expeditions. 



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