Anculosaf. of the Alabama River Drainage 17 



columella purple. 4 were of red and i black. Below Peckerwood Shoals, 

 which are an extension of those of Fort William, purple becomes the pre- 

 vailing color of the columella, with the exception that the fonnosa taken 

 by Mr. White at Wetumpka had the columella white. 



In this species there occur specimens with a ground color of red, show- 

 ing most richly in the columella. One shell from Fort William Shoals is 

 black throughout, or a very dark purple. Material of the flauunata colora- 

 tion appears in lots from Hall's Island, Talladega County, down. 



The embryo shell of fonnosa is smooth, tightly coiled, the apex slightly 

 elevated. It consists of one and one half to one and three-quarters whorls. 

 Probably an adult specimen, if uneroded, would show six whorls. 



Two lots of shells in the Alabama collection, four specimens in all, are 

 labeled as from the Cahaba and Alabama rivers. It is to be suspected that 

 these are cases of mislabeling. Mr. Smith's collecting justifies the belief 

 that Wetumpka is the southernmost point of distribution. 



The operculum is thin, wing-like, dark-red. Left margin firm, nearly 

 straight and slightly bent backward at the acute apex ; right margin broadly 

 curved, very much torn ; basal margin rounded. Growth wrinkles very 

 coarse. The nucleus is located in the lower third of the operculum about 

 I mm. from the left margin. Whorls three. Spiral lines raised, not always 

 well defined or regular. The area of attachment is elliptical, narrow relative 

 to the size of the operculum. The operculum of fonnosa shows a close 

 affinity to that of picta. 



Measurements of Shells: 



Below Minnesota Bend, Etowah County 

 Ten Island Shoals, St. Clair County 



Lonigan Shoals, " " 



Clarence Shoals, 



Fomby Shoals, " 



Truss Shoals, " " 



Hall's Island, Talladega County 



Three Island Shoals, Talladega County 



Ft. William Shoals, " " 



Peckerwood Shoals, " " 



Weduska Shoals, Shelby County 

 The Bar, Chilton County 



Butting Ram Shoals, Coosa County 



Wetumpka. Elmore County 



