160 AMERICAN JOURNAL 



6. Polygyra Febigerii, Bland. 



PlatelO, figures 30, 33. 



Depressed, spire scarcely raised ; whorls 5| — 6, ribbed-striate 

 above, finely striate below, periphery angulate ; aperture subtri- 

 angular, with a small parietal tooth ; base exhibiting about IJ 

 whorls, with a central perforation. Pale reddish horn color. 



Diam. 8-5, alt. 3-5 mill. 



New Orleans. 



Differs from the other species of the genus by having no ex- 

 cavation in the whorl behind the lip. 



7. Polygyra polygyrella, Bland and Cooper. 

 Plate U, figure 26. 



Discoidal, shining, translucent ; spire slightly elevated ; 

 whorls Y — 8, ribbed above, smooth below ; aperture armed with 

 two rows of three teeth each, visible through the whorl, margins 

 joined by a V-shaped tooth ; base widely umbilicate, exhibiting 

 about 3 whorls. Yellowish horn colored. 



Diam. 11-5, alt. 5 mill. 



Coeur d'Alene Mountains. 



It is very doubtful whether this species is properly placed in 

 Polygyra ; it differs in the teeth arranged in ' rows within the 

 aperture. 



Descriptions of additional species of Helices, and notes on some 

 of those already described. 



Aglaja sequoicola, Cooper- 



Plate 11, figure 27. 



" Shell rounded, umbilicate, spire depressed, last whorl some- 

 times subangulate, whorls 6 to 6|, peristome oblique, little de- 

 flected above ; labium thin, reflexed, thickest below ; acute. 

 Color dark brown or olivaceous, with a broad black band be- 

 tween two yellow ones, half hidden on the spire, lips white ; 

 within a fine purple with two white bands. Epidermis shining, 

 polished below, the lines of growth faintly visible, sometimes 

 very lightly malleated, and with spiral ridges ; above with 

 crowded scars bearing very short bristles in the young shell 

 which fall off in the adult. 



