86 THE NAUTILUS. 



ted. The granulated embryonic whorls of Stenotrema and its allies, 

 would seem to make the section Stenotrema of at least subgeneric 

 value, although the almost smooth apex of barbata indicates that 

 there is some variation in the group. The young of barbata are 

 umbilicate. In size there is a wide variation in this species but in 

 all other particulars the characters are absolutely constant. 



Greater diam. 11, lesser 10, altitude 7 mm. 



Greater diam. 10, lesser 9, altitude 6J? mm. 



Greater diam. 8, lesser 7^, altitude 5^ mm. 



The average diameter is 9 to 10 mm. Whorls about o^. 



Types from the flood-plain of the Tallapoosa River near the Mont- 

 gomery Road about five miles southeast, of Wetumpka, Ala., in col- 

 lections of Geo. II. Clapp and Acad. Nat. Sci. Phila. 



This most interesting species was first found by Mr. Herbert II. 

 Smith in November, 1903, and he reports it scarce and apparently 

 very local. 



On Poole's Island in the Coosa River just below the Georgia line, 

 in Alabama, Mr. Smith found a smaller form of barbata which 

 differs slightly in the mouth being still wider and the lip notch 

 weaker. It averages from 8 to 9 mm. diam. 



Polygyra. Stenotrema seminuda n. var. 



In the Proceedings of the Academy of Natural Sciences, 1900, 

 page 129, Dr. Pilsbry defines P. Stenotrema vnr. nuda as follows: 

 " Surface without hairs or their scars ; other characters of typical 

 Stenotrema." 



Among the shells collected by Mr. Herbert H. Smith in Central 

 Alabama is a variety of Stenotrema which differs from nuda in having 

 very short, widely spaced hairs, in other particulars agreeing with 

 var. nuda. As it appears to be a " connecting link," I have called 

 it var. seminuda. In size it varies from 5| x 8 to 7 x 10 mm., the 

 average diameter being 9 to 9^ mrn.; color from greenish- white, al- 

 most albino, to dark reddish-brown. Types from Bangor, 4 miles 

 north of Blount Springs, Blount Co., Ala., in coll. G. H. C. and A. 

 N. S. P. 



Mr. Smith has sent in three or four apparently well-marked varie- 

 ties of Stenotrema, but it will be well to await the conclusion of hi-; 

 work before attempting to define these local race.-'. 



