THE NAUTILI'S. 71 



The varieties marked with an asterisk have been found in Amer- 

 ica. I have seen no American varieties that differ at all from those 

 of Europe. Vars. sylvaticiis, varians and succlneus were sent to me 

 by Mr. H. F. Wickham, who collected them at Portland, Oregon. 

 This is, I believe, the first record of the species from the Pacific 

 coast, but Mr. W. G. Binney informs me that he has L. agrestis 

 from San Francisco, 



NOTES AND EXCHANGES. 



AYestern range of Bythinia tentaculata. — This intro- 

 duced European species is rapidly spreading in America, having 

 already invaded a large part of Canada and New York. It has 

 recent!}' been found by AVm. H. DeCamp, M. D., in Black Lake, 

 Ottawa Co., Michigan. Dr. DeCamp has deposited specimens in 

 the collection of the American' Association o^ Conchologists. 



Helix aspersa in California. — Apropos of the remarks in 

 the August Nautilus on Prof. R. E. Stearns' " List," recording this 

 snail from Puebla, Mexico, reminds me that I have some fine speci- 

 mens of Helix {Pomatia) aspersa, collected in a garden in the city 

 of San Jose, Santa Clara County, California, some twelve years ago; 

 they were doubtless introduced by some of the European resi- 

 dents of that place. Lorenzo G. Yates, Santa Barbara, Cal., Sept. 

 1891. 



Exchange. — What am I offered in exchange for a collection of 

 California Land, Fresh-water and Marine shells containing 65 

 species and numbering 130 specimens? Have plenty of duplicate 

 sets of the above collection. Address, Williard M. Wood, C. C, 

 2817 Clay Street, San Francisco, Cal. 



DR. GEORGE HEWSTON 

 Died Sept. 4, 1891. 



Dr. George Hewston, Avell-known to most American conchologists 

 for his great interest in shells, died Sept. 4, at his residence, 1132 

 Sutter street, San Francisco, California, from Bright's disease of 

 the kidneys. He was born at Philadelphia on Sept. 11, 3826, 



