74 THE NAUTILUS. 



subsequent whorls obliquely flattened above, full and rounded 

 below ; surface marked only witb 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 subcylindrical 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, collisella, alt. 7, maj. diam. 11, min. diam. 95 

 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 llcuqiliill. 



Shell very much depressed; light horn-color; strise of growth 

 very fine with occasional coarser ones at irregular intervals on some 



