PREFACE. 



This volume forms Part II of the Catalogue of Type Specimens in 

 the Department of Geology, in the United vStates National Museum, 

 Part I of which was issued in 1905. It was expected that the two 

 parts would form one volume. It became evident, however, that such 

 a volume would be cumbersome, and hence it was divided into two 

 parts, the first being devoted wholl>' to fossil invertebrates. Part II 

 therefore comprises Section II, devoted to fossil vertebrates; Section 

 III, to fossil plants, and Section IV, to minerals, rocks, and ores. As 

 with Part I, the catalogue closes with January i, 1905. No changes of 

 importance have been made, and it remains only to note that the work 

 of supervising the preparation of Section II, which it was expected 

 would fall upon Mr. L,ucas, was assigned to others, as is mentioned in 

 the introduction. 



George P. Merrill, 

 Head Curator of Geology. 



June I, 1907. 



