170 Annals of the Carnegie Museum. 



In a " Bulletin of the American Museum of Natural History," 1897, 

 Whitfield described a gastropod from the Chazy formation at Valcour 

 Island under the name Bucania champlainensis. As will be shown on 

 a later page, this shell is probably the same as that described earlier 

 as Bucania sulcatina (Emmons). 



In 1902 Raymond described and figured a Bucania as Bucania 

 champlainensis Whitfield, but this also is Bucania sulcatina. At the 

 same time he described a new gastropod from the Chazy at Crown 

 Point, New York, as Eccyliomphalus fredericus. 



In the "Report of the New York State Paleontologist for 1903 " 

 (1905), Hudson described six species of gastropods, making a total 

 list of twenty-one species in the Chazy. 



In two papers, one in November, 1905, and the other in July, 1906, 

 the present writer has published preliminary descriptions of twenty 

 species, which are more fully described and figured in- the present 

 paper. With the five species now described for the first time, the 

 total list of named gastropods in the Chazy formation includes forty- 

 seven species. 



To the gentlemen who have assisted me in the following review of 

 the Gastropoda of the Chazy, I wish to express my thanks. For the 

 loan of the types and interesting specimens I am particularly indebted 

 to ^r. J. F. Whiteaves and to Dr. H. M. Ami, paleontologists to the 

 Geological Survey of Canada ; Professor R. P. Whitfield and Dr. E. O. 

 Hovey, of the American Museum of Natural History ; Dr. Ray S. 

 Bassler, of the United States National Museum, and Dr. H. F. Cleland, 

 of Williams College. 



To Professor Charles Schuchert, of Yale University, and to Dr. E. O. 

 Ulrich, of the United States Geological Survey, I am indebted for kind 

 criticisms and assistance in the identification of the material. 



