The description of Orthurethrous snails is continued in this 

 volume, the remaining groups of Ferussacidcs and the Partu- 

 lidcs being described. In treating of the latter family, the 

 author has had the advantage of studying the types and other 

 specimens of the late Dr. W. D. Hartman, now forming part 

 of the collection of the Carnegie Museum at Pittsburgh. The 

 conclusions reached in the monograph now published have 

 thus been based upon the material of two large collections. 

 The liberality and courtesy of the Trustees of the Museum 

 and of the Director, Dr. William J. Holland, are here grate- 

 fully acknowledged. 



H. A. P. 



(iii) 



