1881.] natural sciences of philadelphia, 8y 



March 22. 

 The President, Dr. Ruschenberger, in the chair. 

 Twenty-six persons present. 

 The death of Jos. A. Cla}-, a member, was announced. 



March 29. 

 The President, Dr. Ruschenberger, in the chair. 

 Twenty persons present. 



April 5. 



The President, Dr. Ruschenberger, in the chair. 



Thirteen persons present. 



The deaths of John Gould, of London, a correspondent, and of 

 Thos. W. Starr, a member, were announced. 



April 12. 

 The President, Dr. Ruschenberger, in the chair. 

 Twent^'-four persons present. 



The death of Col. T. M. Br3'an, of Yincenttown, X. J., a cor- 

 respondent, was announced. 



April 19. 



The President, Dr. Ruschenberger, in the chair. 

 Twenty persons present. 



A paper entitled " Observations on Planorbis," by R. E. C. 

 Stearns, was presented for publication. 



On the Variations of Acmsea j^elfd^ Escholtz. — Mr. Tryon read 

 a portion of a letter from Mr. Henry Hemphill, of Oakland, Cali- 

 fornia, referring to certain specimens of Acmaea, collected b}' him. 

 and presented to the Academy this evening. 



" I will now call your attention to Xos. 457, 458, 459 and 460. I 

 have made two trips to Monterey, Cal., this winter. During mv 



