142 HELICID^. 



f. 2.; Mocpiin Tandoii, ii. 107. t. 10. f. 9— 12. — Zonites 

 radiatus. Leach, Moll. Syn. 74. — Helix perspectiva. Me- 

 gerl, Berl. Mag. — Discus rotundatus. Fitz. Synt. 99. — 

 Patula rotundata. Held. Jsis, 1837. 916. — Euijompbala 

 rotundata. Beck, hid. 9. 



Var. b., spire quite flattened : Helix Turtoni. Fleming, Brit. 

 Aiiim. 269. — Helix albella. LiJin. S. Not. — Helix rotun- 

 data. Turton, Diet. p. 53. 



Var. c, white, transparent, and without rays : Zonites rotun- 

 datus. Gray, Man. 165. t. 5. f. 44. 



Common under stones and wood, on dead trees, 

 and in crevices of old walls. 



Animal pale grey, dotted above ; foot short, hya- 

 line ; back, head, and tentacles blackish [Sturm); 

 jaw slender, striated, and crenulated ; teeth are those 

 of a true Helix, 



Shell about a quarter of an inch in diameter, 

 nearly equally convex on both sides, slightly carinate, 

 strongly and regularly striate across, yellowish or 

 reddish-grey with chestnut rays from the centre; 

 aperture semilunar, as wide as long, thin and not 

 reflected ; umbilicus large and deep. 



This species varies in size and in form, especially 

 of the spire, which is sometimes rather convex, and 

 at others nearly flat : in the latter form, it has been 

 considered as a separate species ; and Nilson believes 

 that the shell which Linnaeus described as Helix albella 

 in his " Swedish Fauna," is only a young species of the 

 flat-spired variety of this shell. It also varies in the 

 intensity of the brown spots on the spire ; sometimes 

 they are diffused and at others entirely wanting, and 

 the shell is sometimes nearly transparent and colour- 

 less. 



The jaw of Helix pygmea {Moq. Tand. t. 10. f. 2.), 



