116 PROCEEDINGS OP THE ACADEMY OF 1883.J 



These facts tend to give this new species ^ its chief importance, 

 and point to further interesting discoveries. 



Specimens of Pyrgula Nevadensis have been distributed to the 

 Museum of the Acad. Nat. Sci. Phila. ; the U. S. National 

 Museum, Washington ; the Museums of the. University of Cali- 

 fornia and California Acad, of Sciences ; and are contained in the 

 cabinets of Professor A. E. Call and my own. 



' Mr. John AVolf has described Pyrgula scalar if or mis from the post- 

 pliocene of Tazewell, Illinois River. Vide Tryon, in Proc. Acad. Nat. 

 Sci. Phila., May 1, 1873. 



