202 • PROCEEDINGS OF THE ACADEMY OF [Feb., 



ity for this species, which in its cuticiilar processes is the most aberrant 

 of the gentts. The original specimens were denuded of the long fila- 

 ments characteristic of the species in a fresh condition, and hence the 

 published description did not mention them. These filaments are 

 long, more or less curved, flexible, and arise in triangtilar laminae 

 from the narrow riblets of the surface. They stand in three principal 

 rows on the body-whorl, one at the periphery, the others above and 

 below it, the upper one ascending the spire midway between sutures. 

 The inner 2h or 8 Avhorls are free from filaments. The base is encircled 

 by two minor and imperfect rows inside the subperipheral one. 



In all other Stenotremes except P. harbigera (Redf.) the cuticular 

 hairs form a comparatively close pile, and they are arranged in oblique 

 sweeps, or are merely adnate and prostrate appendages trending in 

 the direction of growth-strise. In no other do they form a series of 

 circular, concentric fringes. P. harbigera has a single fringe of similar 

 filaments, usually persisting at the suture only. 

 Polygyra labrosa (J'.land). PI. IX, figs. 4, 5, c. 



Helix labrosa Bid., Ann. Lye. Nat. Hist, of N. Y., VIT, 430 (1S61). 

 Stenotrema lahrosum (Bid.), JBinney, Man. Amer. Land Shells, 274. 



Petit Jean Mountain, Yell county, western Arkansas; Seligman, 

 J^arry county, southwestern Missouri. Also Chester,* Hot Springs,* 

 Carrion Crow Mountain, Ark.* 



Figured for comparison Avith the other Southwestern Stenotremes, 



the figures published hitherto being in outline and ciuite inadequate for 



exact comparisons. The Tennessee specimens I have seen are more 



distinctly striate beneath and much paler than those from Arkansas, 



the aperture white. From the data now available it looks as though 



the range of P. labrosa is discontinuous, being interrupted by a wide 



strip of low country along the Mississippi; but its distribution in 



Tennessee and Alabama calls for further investigation, as no definite 



locality in either State is given, either in the books of Mr. Binney or 



on the labels of specimens from Bland in the Academy collection. 



Sampson has reported P. labrosa from eleven counties in middle and 



western Arkansas. 



Polygyra uncifera Pilsbiy. Pi. IX. figs. 7, 8, ',). 10. 



P. hirsuta uncifera Pils., Proc. A. N. S. Phila., 1900, p. 453 (September 27, 

 1900); Ferriss, Nautilus, XIV, p. 30, No. 139c (1900). 



Polk county, western Arkansas, at Mena and the adjacent Chastat 

 Mountains, and Rich Mountain. 



The peculiar structure of the peristome of this form certainly indi- 

 cates a distinct species, and not, as I at first thought, a subspecies of 



