1903.] NATURAL SCIENCES OF PHILADELPHIA. 203 



F. hirsuta. Sometimes the parietal lamella is recur\-od at the outer 

 end, hook-like, as in the type (fig. 7), ))ut in most of the specimens 

 from Rich Mountain the recurved part is quite separate from the 

 lamella, standing apart as a short entering denticle (figs. 8, 9, 10). I 

 have observed no other variation of note except in the size and number 

 of whorls, the Rich Mountain series measuring from 6.5 mm. diam. 

 with 4j whorls to 8.2 mm. with 5j whorls. The "fulcrum" is quite 

 long, as in typical hirsuta, and notched above and below. 



Polygyra hirsuta has not been reported from Arkansas, so far as I 

 know, and evidence is still wanting that it occurs west of the Missis- 

 sippi south of Kansas and Pettis county, Mo., whence it is recorded by 

 Sampson. I regard the specimens reported by Dr. Stearns from the 

 "banks of Yaqui river near Guaymas"' as probably Eastern shells 

 accidentally mixed with those from the locality named. The south- 

 western range of P. hirsuta is apparently much more limited than that 

 of many of the Eastern snails. 

 Poly&yra blandiana n. sp. PI. IX, figs, il, 12, 13. 



Shell imperforate, depressed, obtusely angular at the periphery, the 

 spire slightly convex, base much more convex, owing to the high 

 position of the peripheral angle. Chestnut-brown; the surface rather 

 glossy and partially dull; nearly smooth, having weak growth-wrinkles 

 above, fainter on the base; without hairs or their scars. Whorls 4§, 

 moderately convex, the last shortly deflexed in front. Aperture re- 

 sembling, in general, that of P. hirsuta, but narrower; the outer end 

 of the parietal lamina is abruptly bent inward, and its crest a little 

 notched. The notch in the basal lip, which seems shallow in a basal 

 view, is seen in front or oblique view to be deep, with a raised border. 

 The outer curve of the lip is rather deeply notched. Fulcrum long, 

 at a right angle with the aperture. 



Alt. 4, diam. 8 mm. 



Alt. 3.8, diam. 7 mm. 



Springfield, Green county, southwestern Misscuu-i, copiously; Selig- 

 man'* Barry county, Mo., 3 specimens. 



This very distinct race differs from P. hirsuta in the following par- 

 ticulars: The shell is much more depressed and obtusely angular at 

 the periphery; it shows no trace of hairs; the parietal lamella is more 

 curved and stands nearer the basal lip, thereby causing the aperture 

 to be narrower; the notch in the basal lip is larger, etc. 



In a rather large series of shells, no specimens at all intermediate 

 in characters were found. 



^Proc. U. S. Nat. Mus., XVII, 162 (1894). 



