1906.] NATURAL SCIENCES OF PHILADELPHIA. 545 



This is a further development of P. infiecta form No. 1, described 

 above. 



Polygyra edentata (Sampson). PI. XXII, figs. 11, 15, 16. 



Triodopsis edentata Sampson, Nautilus, III, p. 85, December, 1889. 

 Triodopsis edentula Sampson, W. G. Binney, Third Supplement Terr. Moll., 



V, p. 190. 

 Polygyra edentata Sampson, Pils., Man. of Conchy VIII, p. 154, pi. 50, figs. 

 16-18; Proc. A. N. S. Phila., 1903, p. 197. 



The original specimens came from the summit of the Boston Mts., 

 at Winslow, Washington Co., Ark. Mr. Sampson found it also at 

 Porter, Crawford Co., and Ferriss took specimens at Chester, in the 

 same county. These localities afford specimens 12 to 14 mm. in diam. 



P. edentata differs from P. infiecta by the reduction of the two lip- 

 teeth to small and inconspicuous prominences, which however occupy 

 the positions of the prominent teeth in P. infiecta. The specimens 

 from Chester have a somewhat sharker, higher crest behind the lip 

 than the others. 

 Polygyra edentata magazinenois n. subsp. PI. XXII, figs. 12. 13, 14, 17, 18. 



Similar to P. edentata, but more contracted behind the lip, and with 

 the aperture less rounded, more triangular, the lower lip-tooth absent, 

 replaced by a low, wide prominence nearer to the columellar end of the 

 basal lip; scale-like cuticular processes well developed. 



Alt 7 7 7 6.7 7 6 6 mm. 



Diam 14 13.5 13.3 13 12.5 12 11.5 *' 



Most of the series of 114 specimens measure from 13 to 14 mm. 

 diameter. All agree in the shape of the aperture and peristome, 

 which varies remarkably little. 



Magazine Mountain, Logan Co., Ark., in a talus of large rocks under 

 the cliff on the north side of the summit plateau (Ferriss and Pilsbry 

 March 28-30, 1903). We found a single dead specimen on the south side, 

 near where the road ascends the cliff. 



The smallest specimens are distinctly angular at the periphery in 

 front. 



Polygyra cragini (Call). 



Triodopsis cragini Call, Bull. Washb. Coll. Lab. N. H., I, No. 7, p. 202, fig]5. 

 December, 1886 (banks of Chetopa Creek, Neosho Co., Kansas). j , 



This small Triodopsis varies but little so far as present collections 

 indicate. It borders the Ozark elevation on the west, from Kansas to 

 Texas and Louisiana, the localities known to us by specimens up to this 

 time being as follows : 



Southeast Kansas: Nesoho Co. (Cragin); Thayer (Ferriss). 



