THE N^AUTILUS. » 



Vertigo boUesiana Morse, from New York or Ohio,i and also the 

 lamellse are much alike. One peculiarity is that in about one-third 

 of the examples a part of the shell is wanting, always on the side of 

 the aperture, so that 3 or even 4 whorls are opened. This can hard- 

 ly be accidental, and probably that part of the thin shell is worn off 

 by friction in moving. I would propose to name this form var. cata- 

 linaria ; others might regard it as a species, as it appears to be rather 

 well defined, and distinct from the other forms. 

 i^To he continued.) 



AMERICAN ASSOCIATION OF CONCHOLOGISTS. 



JuNi: 4, 1890. 



John H. Campbell, President, Philadelphia. Cypraeidae. 

 Charles W. Johnson, Secretary, Philadelphia. Soidh American 

 Molhisca. 



Frank C. Baker, Philadelphia, Pa. Muricidae. 



Rev. AY. M. Beauchamp, Baldwinsville, N. Y. Land and Fresh 

 Water Shells of North America. 



Theodore G. Brinton, Philadelphia, Pa. Mitridue. 



J. J. Brown, M. D., Sheboygan, AVis. 



F. C. Browne, Framingham, Mass. Xassidae and Strophia. 



H. F. Carpenter, Providence, R. I. Shell-bearing Molla.ica of 

 Rhode Island. 



Prof AYm. B. Clark, Baltimore, :\[. D. Eocene Mollusca. 



Thomas C. Curry, Connersville, Ind. Succineidae. 



Wm. H. Dall, AYashington, D. C. Abyssal Mollusks. 



Rev. A. Dean, ]Muncy, Pa. Fusidae. 



Geo. AV. Dean, Kent, Oliio. Helicidae. 



James M. Delaney, Rochester, N. Y. 



L. B. Elliott, Iowa City, Iowa. Dentition. 



Frank J. Ford, AVichita, Kan. Papidae. 



John Ford, Philadelphia, Pa. Olividae. 



T. Alarshall Fry, Syracuse, N. Y. Unionidae. 



Uly. S. Grant, Minneapolis, ]\Iinn. Land and Fresh Water shells 

 of North America. 



1 The New York and Ohio specimens of V. bollesiana are larger and more 

 di>tinctly striate than those from New England and Canada. 



