cult and successful exploits brought in splendid material from 

 hitherto unheard of localities. 



While visiting Washington with pockets and bags full of 

 material for comparison, the writer has been received b}- the 

 Department of Mollusca as a prodigal son, in the spirit of true 

 friendship. It is certainh' fortunate for American Tertiary 

 Paleontology that there has been at the National Museum a man 

 of Dr. Dall's erudition and sympathetic interests. 



It is much to be regretted that time and means have not 

 been at the writer's command for properly illustrating more of 

 Conrad's type specimens at the Philadelphia Academy. Yet 

 with the bivalves the need is not so great as with the univalves. 

 The facilities for work already afforded at the Academy by the 

 curator, Dr. Pilsbry could not be better and in the near future 

 the writer hopes to have the greater, or, as yet poorly illustrated, 

 part, of the Conradian collection properly photographed. 



Aside from the facilities the writer has enjoyed in working 

 out his own material at various museums, mention must be made 

 of the fact that among others. Dr. Dall of Washington, Hon. T. 

 H. Aldrich of Birmingham, Alabama, and Prof. Whitney of 

 Austin, Tex., have sent specimens for comparison and have 

 loaned co-types and furnished materials used in various genera 

 throughout this work as will be noted in reading descriptions 

 and consulting the illustrations with their accompanying ex- 

 planations. 



