46 



THE NAUTILUS. 



Rev. John Walton has changed his addi-ess from Lakeside, N. Y., 

 to Pittsford, N. Y. Members will please take notice. 



F. C. Browne, Framingham, Mass., writes : " I am afraid the 

 members are not going to get the benefit they might, if they would 

 correspond." It is one of the objects of the Association to induce 

 correspondence between the members, especially between members 

 interested in the same or analogous subjects. Comparison of views, 

 exchanges of specimens, etc., will add to our stock of knowledge. 



M. M. Shepman of Rhoon, near Rotterdam, Holland, writes : 

 "I would like to have some information about the American 

 Association of Conchologists, You will oblige me with a copy of 

 the rules." The Secretary has supplied him with the information. 



It may soon be possible for the Association to prepare a complete 

 list of North American shells. Several of the members have 

 selected the mollusca of special districts for study, and in time it is 

 expected that the whole continent will be covered. As soon as that 

 point is reached, each member might furnish a list of the mollusca 

 of his district, with authentic localities and by consolidating the 

 lists, an Association check list could be prepared. So far, the follow- 

 ing districts are covered : Rhode Island, H. F. Carpenter ; Wis- 

 consin, Geo. T. Marston ; Michigan, M. L. Leach, M. D.; Kansas, 

 J. B. Quintard ; West Coast, Prof Josiah Keej), JNIiss Ida M. 

 Shepard, W. J. Raymond and G. W. Lichtenthaler ; North West 

 Atlantic, Sanderson Smith ; Vancouver Province, Geo. W. Taylor.; 

 Besides these the Land and Fresh Water shells of North America are 

 being studied by H. A. Pilsbry, F. R. Latchford, Geo. W. Harper, 

 Bryant Walker, J. A. Singley, Rev. W. M. Beauchamp, Wm. G. 

 Mazyck, D. V. Sterki, W. W. Westgate, U. S. Grant, W. G. 

 Binney, and W. S. Strode, M. D. 



THE SHELL-BEARING MOLLUSCA OF RHODE ISLAND. 



BY HORACE F. CARPENTER. 



FAMILY UNIONID.E. 



191. — Margaritana viarginata, Say. 

 Syns.: 



Ala.wiodonta marglnata, Say, Barnes, Con. Stimp. Adams 



Uaio varicosa, Lam. 



