HELIX. 109 



mutabilis part. Hartm. N. alp. i. 242. — Helicogena nemo- 

 ralis. Risso, Eur. M. iv. 60. — C8Dpa3a nemoralis. Held. 

 Isis, 1837,910. — Helix subglobosa. Binney., Boston Jour. 

 N. H. i. 485. f. 7. 



Inhab. woods and hedges. 



Animal dirty or yellowish grey ; head, tentacles, 

 and two streaks from the tentacles blackish (Sturm, 

 t. 24.). Jaw strong, costated, and toothed. 



Shell hardly an inch in diameter, and about three 

 quarters high, glossy, semitransparent, finely striate ; 

 spire composed of five rounded volutions ; aperture 

 semielliptic, longer than wide, the peristome produced 

 at the pillar in a nearly straight line, where it is flat- 

 tened and thickened, surrounded by a chocolate or 

 reddish- brown border. 



The shell varies — 



1. Greatly in the intensity of the colour, being 

 sometimes pellucid white, yellow, reddish, or brown. 



2. In being plain, or marked with five or fewer 

 bands (some of the bands being deficient). 



3. In the bands varying very considerably in 

 breadth, being sometimes narrow, at others broad, 

 when two or more of them are often confluent. 



4. The bands are generally black or brown, but 

 sometimes pellucid and nearly colourless. 



5. In size, according to the abundance of food, or 

 locality. 



Monstrosities, with the whorls much produced, or 

 even detached from one another, or turned in the 

 contrary direction, sometimes occur, (See Ferussac, 

 Hist. Moll. t. 34. f. 8, 9. t. 32. a. f. 2.) 



Mr. Sheppard believes that the plain sort {H. ne- 

 moralis Shepp.), the one-banded (H. cincta Shepp.), 



