542 PROCEEDINGS OF THE ACADEMY OF [DeC, 



Polygyra monodon (Rack.). 



Helix monodon Rackett, Linnean Trans., XIII, 1822, p. 42, pi. 5, fig. 2. 

 Stenotrema monodon var. leaii Ward, Binney, Man. Amer. Land Shells, p. 281, 



fig. 297. 

 Polygyra ynonodon Pils., Proc. A. N. S. Phila., 1900, p. 454. 



The southern range of typical P. monodon (Stenotremaleaioi authors) 

 seems to barely reach the Ozark region. Mr. F. A. Sampson records it 

 from Sedalia, Pettis Co., and Lamar, Barton Co., Mo., and Carroll, 

 Benton, Washington and Nevada counties. Ark.; also Neosho Co., 

 Kan. We have not ourselves seen Arkansas specimens. The following 

 subspecies replace P. monodon in the Southwest. 

 Polygyra fraterna friersoni Pils. 



Nautilus, XIII, p. 36 (1899); Proc. A. N. S. Phila., 1900, pp. 454-456. 



The shell is perforate or rarely closed, with 6^ whorls, a long fulcrum, 

 much longer than in P. f. imperforata, and no distinct notch at the 

 base of the columella. It is larger than P. f. alicice with more w^horls. 

 Numerous localities are given in Pilsbry's paper of 1900, to which the 

 following may be added' Fayette Co., Tex., and Nashville, Tenn., 

 in an open field, collected by A. G. Wetherby. This is the only locality 

 known east of the Mississippi River. The type locality is Frierson, La. 



Tolygyra fraterna (Say). 



It is somewhat peculiar that this form turns up in central Texas, 

 where it was taken by us at and near New Braunfels, and by Pilsbry at 

 Austin about 14 years ago. 

 Polygyra fraterna imperforata Pils. 



Proc. A. N. S. Phila., 1900, p. 455; 1903, p. 204. 

 We took this form on the Poteau Mts., south of Gwynn P. 0. (Hart- 

 ford Station), Sebastian Co., Ark. It is known also from Rich Mt. and 

 Mena, Polk Co., and Rocky Comfort, Little River Co., Ark. One 

 of the types from the last locality measures: alt. 7.7, diam. 10.5 mm. 

 to alt. 6.7, diam. 9 mm. 

 Polygyra fraterna aliciae Pils. 



Helix monodon var. alicice Pils., Man. Conch., VIII, p. 152. Feb. 25, 1893. 



Polygyra monodon alicice Pils., Proc. A. N. S. Phila., 1900, pp. 454-456; 1903, 

 p. 204. 



This form is typically small and elevated with very convex base, 



narrowly perforate axis, and 5^ to 6 whorls. The degree of elevation 



varies a good deal. The fulcrum is long and strongly notched above 



and below. The basal lip has a more or less strongly developed 



flange on its face, somewhat as in P. vultuosa, with a notch where it 



ends at the columella. Specimens of the type lot from Lake Charles, 



La., measure from 5x7 mm. to 5.7 x 7.8 mm. 



