AMERICAN 



JOURNAL OF C0NCH0L0GY. 



NEW SERIES. 



PUBLISHED BY THE 



CDNCHOLO&ICAL SECTION of the Academy of Natural Sciences of Philadelphia 



Vol. IV. 1868. No. 4. 



Meeting October 2d, 1868. 



Ten members present. 



Mr. Tryon, Vice Director, in the Chair. 



Various donations to the Museum and Library were an- 

 nounced. 



The following letter from Dr. J. G. Cooper, a corresponding 

 member of this Section, was presented : 



San Francisco, May 8th, 1868. 

 To the Secretary of the Conchological Section. 



Dear Sir: Mr. Tryon's review of my "West Coast Helicoid 

 Land Shells," in Vol. iii. No. 4, of the " Journal of Conchology," 

 calls for a few explanatory remarks to correct some apparent 

 misapprehensions on his part, and to give additional facts re- 

 lating to the subject. I did not intend the paper to go so far as 

 to "attempt a new arrangement into subgenera," or I would 

 have given names for them. I merely gave a partially new ar- 

 rangement and adopted no generic names but Binneya and Vitrina, 



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