68 THE NAUTILUS. 



found alive in the Colorado river, only a few hundred feet away. 

 This brings up some interesting questions relating to geographical 

 distribution, of which the writer may treat later. 



Foreigners. Limax maximus has appeared in San Diego 

 gardens ; Helix nitidiis is also not rare at San Diego, and hundreds 

 were found in the grounds of the University of California, at 

 Berkley, recently. The trunks of several Australian tree ferns 

 have also afforded a Helix and one or two slugs new to the Avriter. 



AMERICAN ASSOCIATION OF CONCHOLOGISTS. 



October 1, 1890. 



President, John H. Campbell. 

 Vice-President, John Ford. 

 Secretary, Chas. W. Johnson. 

 Since last announcement the following new members have been 

 enrolled in the Association : 



98. Wm. J. Fox, Philadelphia, Pa. Cerithiidae and shells of 

 Neiv Jersey. 



. 99. Mrs. E. P. Gaylord, Detroit, Mich. Cypraeidae. 

 ]00. Prof J. B. Steere, Ann Arbor, Mich. 

 Several applications are pending. It would facilitate the admis- 

 sion of applicants, if they would refer to some member of the Associa- 

 tion, with whom they are acquainted either personally or b}' corre- 

 spondence. 



Mr. H. A. Pilsbry, Conservator of the Conchological Section of 

 the Academy of Natural Sciences, (at the suggestion of the President 

 of the Association), has commenced the formation of a special ex- 

 hibit of United States Shells. It is his intention to have every 

 species of mollusk found in the United States, represented in the 

 collection, and if the members of the Association will assist in the 

 work, he will so arrange it, that none but members shall contribute 

 specimens, in order that the collection may be the special exhibit of 

 the American Association of Conchologists. If the idea is success- 

 fully carried out, similar collections may be formed in other cities of 

 the United States, so that any person wishing to identify a species, 

 will have the material accessible for reference, to enable him to do 



