IOWA ACADEMY OF SCIENCES. 



A— Incrusting Solids. 

 B— Non-lncrusting Solids. 

 C— Additional Information. 



Good 6 to 12 1 



Medium... 11 to 18 I Comparative rating based on 



Bad 18 to 28 ; total gains of Incrusting Solids. 



Very bad 28 to 00 J 



SOME OBSERVATIONS ON HELIX COOPER!. 



BY F. M. WITTER, MUSCATINE. 



In "Land and Fresh Water Shells," Part I, by W. G. Binney and T. Bland, 

 1869, the mollusk to which I invite your attention is called Helix cooperi. In 

 " Manual of American Land Shells," by W. G. Binney, 1885, this little mollusk is 

 honored with the following synonymy: Helix strigosa, Gould; Anguispira stri- 

 gosa, Tryon; Helix cooperi, W. G. Binney; Anguispira cooperi, Tryon; Helix 

 hngdeni, Gobb, Patula strigosa, W. G. Binney; Anguispira hruneri, Ancy. In 

 this work Mr. Binney uses the second name proposed by himself, viz: Patula 

 strigosa. Inasmuch as the regions inhabited by this creature are quite diverse in 

 regard to climate and food, it would seem most likely a considerable variation in 

 size, form and color would necessarily follow. It appears to be at home throughout 

 the Rocky Mountain region in the United States. 



On July 12th, 1892, I was just starting up the Rabbit Ear mountains, from the 

 southwest corner of North Park. After crossing Colorado creek, a branch of Big 

 (rrizzley, dead Helix cooperi were noticed in the road. A little search soon 

 revealed the living mollusk. Here is plenty of sage brush about two feet high, 

 with here and there clumps of a woody plant about the same height as the 

 sage brush, with a dark green leaf. Bunches of two or three kinds of herbaceous 



