HELIX. 



lo5 



sometimes narrowed by a small denticle on the parietal wall ; 

 peristome wliite-lipped, expansively reflexed, its basal margin 

 sometimes unidentate. 



Animal (of H. albolahris) varying from pure white and cream 

 color, through various shades of gray to blackish ; upper part 

 of head and neck slightly brownish; extremities of eye-peduncles 

 smoky; eyes black. Eye-peduncles more than 12 mill, in length 



Fis. 227. 



Animal of Udix albolabrU. 



when fully extended, slender and cylindrical. Foot with a 

 slightly expanded margin terminating posteriorly in an acute 

 angle. Glandular tubercles very distinct and prominent, on the 

 back arranged longitudinally, on the eye-peduncles long and 

 narrow. Extreme length 62 mill. 



Fie. 228. 



Helix major, Binney. — Shell imperforate, conoidly-subglobose, 

 solid, with crowded, fold-like strife, and a few interstitial microscopic 

 revolving lines ; reddish horn-color or 

 chestnut ; spire conoid, the apical point 

 snaall ; whirls six, convex, the last ven- 

 tricose, scarcely descending in front ; 

 aperture diagonal, roundly lunate, whit- 

 ish within ; peristome with a white 

 thickening, its terminations joined by a 

 thin callus, the right and basal portions 

 rather broadly expanding and reflected, 

 the coluniellar portion subdentate, di- 

 lated, suliexcavated, adhering. Greater 



diam. 37 i, lesser 31 ; height 26 mill. 



Helix vKiJor. 

 Helix major, Binney, Bost. Journ. Nat. 



Hist. I, 473, pi. xii (1837) ; Terr. Moll. II, 96, pi. i.— DeKay, N. Y. 



