170 INVERTEBRATA OF MASSACHUSETTS. 



HELIX ALBO'LABRIS. 



Shell orbicular ^conical, yellowish horn-color ; whorls five or six, 

 convex, marked with the lines of growth, and minute revolving 

 lines; lip white, broadly reflected; umbilicus closed. 



FIGURE 101. 



State Coll., No. 101. Soc. Cab., No. 1008. 



Helix albolabris, SAY ; Nicholson's Encyc., (Amcr. ed.,) iv. pi. 1, f. 1. Long's 2d 

 Expedition to St. Peter's River, ii. 258. Amer. Conch, pi. 13. FE'RUSSAC ; Hist, 

 des Moll., pi. 43, f. 1 to 3. BINNEY j Monogr., pi. 2. Bost. Journ. Nat. Hist., i. 

 475, pi. 13. 



Cochlea Virginiana, LISTER ; Conch., t. 47, f. 45. 



Shell orbicular, depressed-conical, thin, shining, of a yellowish- 

 brown or russet-color ; whorls five to six, rounded, separated by 

 a well-defined suture, and forming a moderately elevated spire, 

 regularly and distinctly wrinkled by the lines of growth, which are 

 crossed by very numerous, delicate, revolving hair lines, scarcely 

 visible without a magnifier ; aperture semi-elliptical, contracted 

 by the lip, which is white and very broadly reflected ; outer edge 

 sharp, somewhat waved, and colored orange on the back ; umbili- 

 cus, covered by the extremity of the lip. Diameter generally 

 over one inch. 



The animal varies in color, sometimes being pure white, 

 cream-color, or grayish ; head brownish above ; tentacula dusky 

 at tip ; eyes black ; back shagreened with glandular tubercles ; 

 foot rather more than twice the diameter of the shell, pointed be- 

 hind. 



Found in large numbers in all the partially cleared forests of 

 New England, sheltered in the moist mould under decaying logs 

 and rotten stumps ; and sometimes about stone walls and rocks in 

 the open fields. It is found in all the States, except, perhaps, 

 the southernmost. 



This is our largest snail, and, though so simple in its structure and 

 coloring, is a pleasing shell. Its delicately striated surface, and 

 broad, white lip, cannot fail to gain admiration. It is subject to very 

 little variety, the principal variations being its want of the white re- 



