74 THE NAUTILUS. 
subsequent whorls obliquely flattened above, full and rounded 
below; surface marked only with incremental lines and irregular 
minute vermiculations in general harmony therewith; color a dark 
plum hue, which where covered by the brownish epidermis 
appears nearly black ; at the periphery a narrow white or yellowish 
band, above it two narrower, nearly equidistant smaller ones, that 
nearer the suture more or less obscure on the last whorl; the 
whitish bands are visible inside the aperture, the rest of the shell is 
dark; aperture ample, produced above, the lip slightly thickened, 
the pillar broadly reflected over a moderate umbilicus. Alt. 30, 
max. diam. 40, min. diam. 32 mm. 
This species is more depressed than H. eximia, and has one less 
whorl, a darker base and less reflection of the peristome. The 
granulation is rather sparse and very irregular. 
Near San Sebastian, Jalisco, Mexico, Nelson. 
Polygyra Nelsoni n. sp. 
Shell dark brown, of five and a half rather depressed whorls; 
suture distinct, surface with well-marked even riblets, separated by 
wider interspaces, except on the nepionic shell which is smooth, 
and of two whorls; periphery above the middle of the whorl, base 
rounded with a deep subeylindrical umbilicus; aperture depressed 
above, with a wide, reflected, white peristome; basal lip with two 
well developed teeth and wide callus on the inner edge of the peri- 
stome outside of the outer tooth; body with a long sigmoid or 
nearly V-shaped tooth nearly parallel with the basal lip. Alt. 7-2, 
maj. diam. 14°5, min. diam. 12°0 mm. 
With the last. This species differs from P. matermontana Pils. 
(from Colima) by its coarser ribbing, larger size and smaller 
umbilicus, the peristome is also more oblong. P. plagioglossa Pfr. is 
smaller with a rounder aperture. A smaller relatively more 
‘elevated variety, coJlisella, alt. 7, maj. diam. 11, min. diam, 9°5 
mm., was found at San Sebastian and La Laguna, Jalisco, by Nelson- 
The latter is on the Sierra de Guanocatlan. 
DESCRIPTION OF A NEW VARIETY OF LAND SHELL FROM IDAHO. 
BY HENRY HEMPHILL. 
Helix devia variety Clappi Hemphill. 
Shell very much depressed; light horn-color; strize of growth 
very fine with occasional coarser ones at irregular intervals on some 
