HELIX. 



83 



Fig. 146. 



The animal is described by Morse as bluish- 

 wliite, with head, neck, and eye -peduncles 

 mottled by streaks and dots of bluish-black; 

 disk yellowish-white. 



Jaw but slightly arcuate, of uniform width 



throughout, long, 



111 4. Fi?. 147. 



narrow, ends blunt ; 



anterior surface with 

 coarse striae, not modifying the con- 

 cave margin, which has an obtuse, 

 wide, slight median projection. 



Lingual membrane with 77 rows of 13 — 1 — 13 teeth each; 



Animal of Helix 

 asteriscus. [Morse.] 



Jiiw of Jlelix asteiixctts. [aMouse.] 



Fig. 148. 



mmm 



Lingaal dentitioa of Helix asteriscus. [Morse.] 



centrals very short, tricuspid ; laterals long, bicuspid ; uncini 

 wide, narrow, serrate. 



149. 



Subgenus STROBILA, Morse." 



Shell umbilicated, globose conic or depressed, obliquely and 

 coarsely striated, smoother below ; whirls 5 

 or 6, the last globose ; aperture Innately 

 rounded ; peristome thickened, reflected ; the 

 parietal wall and base of the last whirl each 

 with two or more entering revolving laminae. 



Animal quite small in comparison to the 

 size of the shell ; eye-peduncles thick, bulbous, 

 eyes very large {H. lahyrinthica). 



' Journal Portland Society Nat. Hist. I, 26 (1864). 



Animal of Helix 

 lahyrinthica. [Morse.] 



