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The Nautilus. 



Vol. XVIII. AUGUST, 1904. No 4. 



LIST OF ALABAMA SHELLS COLLECTED IN OCTOBER AND 

 NOVEMBEE, 1903. 



A. A, HINKLEY, 



For several years I have been interested in the variations and 

 geographical distribution of the family Pleuroceridce of our fresh 

 water shells. Under the same environments a species will often 

 show considerable variation, while specimens from widely diflferent 

 stations will show very marked differences which are often confusing 

 in the determination of species. This has been one cause of the large 

 synonymy of this group. 



Last fall I had the pleasure of a short visit to several of the 

 streams from Decatur to Montgomery, Alabama. At Decatur, a 

 stop between trains did not allow much time for collecting. 



At Blount Springs, Randolph creek was followed over most of its 

 rock-bed between the mountains, from the railroad to the bottom 

 lands of the Mulberry river. The river was followed up stream for 

 several miles. Most of the distance the water was shallow, flowing 

 over a seamed rock-bed. 



The Black Warrior was followed from the wagon bridge near 

 Warrior to the L. and N. R. R. bridge. The only shoal places were 

 at the two bridges. 



The Bucksehatchee creek near Calera was a water course with 

 pools here and there. 



A walk of three miles from Calera to Wilson's creek gave an 

 opportunity to follow that shaded stream into Montevallo. Individ- 



