PROCEEDINGS 



OF THE 



ACADEMY OF NATURAL SCIENCES 



OF 



PHILADELPHIA. 



1911. 



January 3. 

 Henry Skinner, M.D., in the Chair. 



Thirty-seven persons present. 



Mr. James A. G. Rehn made a communication on the Hebard 

 Academy Expeditions to the western United States, 1909 and 1910. 

 (No abstract.) 



January 17. 

 Philip P. Calvert, Ph.D., in the Chair. 



Thirteen persons present. 



The reception of a paper entitled "The Fishes of Delaware," by 

 Henry W. Fowler (January 14), was reported. 



Henry A. Pilsbry, Sc.D., made a communication on the natural 

 history of the Mexican boundary, embodying an account of his expe- 

 dition of the summer and fall of 1910, with special reference to a 

 knowledge of the molluscan fauna. (No abstract.) 



