[110] 

 6. Polygyra Febigerii, Bland. 



Plate 10, figures 30, 33. 



Depressed, spire scarcely raised ; whorls 5J — 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. JPale 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'AlSne 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 sybangulate, whorls 6 to 6J, 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. 



