^MERICA.lSr 



JOURxNAL OF CONCHOLOGY. 



NEW SEKIES. 



PUBLISHED BY THE 



CONwHOLOGICAL SECTION of the Academy of Natural Sciences of Philadelphia 

 Vol. VI. 1870-71. Part 2. 



Meeting April 7th, 1870. 



Seven members present. 



Dr. W. S. W. Ruschenberger, Director, in the Chair. 



A number of additions to the Library and Museum were an- 

 nounced. 



The following paper was offered for publication, and referred 

 to a Committee : 



"Monograph of the Fluviatile Mollusca of the United States. 

 Part 4th (completing the work) ;" by Geo. W. Tryon, Jr. 



Mr. Tryon read a communication from the family of Guiseppe 

 Stabile, of Milan, late a Correspondent of this Section, an- 

 nouncing; his decease. 



The followinn: communication was read, and directed to be 

 printed in the Journal : 



3Iohau'k, K r., April 2d, 1870. 

 To Dr. Jos. Leidy : 



It will be remembered that those Avriters who have spoken of 

 the soft jmrts of certain of our species oi Lijmncea have been 

 unable to point out any differences that would aid the student in 

 discriminating. My own observations, so far as they relate to 

 the group that embraces the forms to which have been given the 



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