8G THE NAUTILUS. 



ted. The granulated embryonic wliorls of stenotrema and its allies, 

 would seem to make the section Stenotrema of at least subgcneric 

 value, although the almost smooth apex of barbata indicates tliat 

 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 otlier particulars the characters are absolutely constant. 



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



Greater diam. 10, lesser 9, altitude 6^ mm. 



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



The average diameter is 9 to 10 mm. AVhorls about 5^. 



Types from the flood-|)lain of the Tallapoosa Kiver near the Mont- 

 gomery Road about five miles soutiieast of Wetiimpka, Ala., in col- 

 lections of Geo. H. Clapp and Acad. Nat. Sci. Phi la. 



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

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

 very local. 



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

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

 differs slightly in the mouth being still w-ider and the lip notch 

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



Polygyra stenotrema semiimda n. var. 



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

 page 129, Dr. Pilsbry defines P. stenotrema vnr. mida as follows: 

 " Sui'face without hairs or their scars ; other characters of typical 

 stenotrema.''' 



Among the shells colbcled by Air. Herbert H. Smith in Central 

 Alabama is a variety of stenotrema which differs irom nnda 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. seminiida. In size it varies from ^^ x 8 to 7 x 10 mm., the 

 average diameter being 9 to 9^ mm.; 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 vai-ie- 

 ties of stenotrema, but it will be well to await the conclusion of his 

 work before attempting to define these local race.-. 



