61 



46. Helix pygmcea. Shell rather convex, pale 

 chocolate brown, semitransparent : aperture semi- 

 lunar : umbilicus large. 



Helix pygmaea. Drap. p. 114. t. 8./. 8 — 10. 



Shell half the size of the last, of a pale and hardly- 

 transparent brown horn-colour, slightly striate, 

 equally convex on both sides, with the apex 

 usually whitish as if decorticated, with four well 

 defined volutions : aperture roundish crescent- 

 shaped, as long as it is wide. 



Dr. Leach considers this as the young of the last 

 species, from which it evidently differs in colour, 

 appearance, and locality, as the two species are 

 never found together. 1. it is much flatter and 

 more transparent; 2. it has only four volutions ; 

 3. the aperture is not so circular ; 4. it is only 

 found in ditches and wet places, among dead leaves. 



47. HELix/w/ya. Shell rather conic and trochiform, 

 with six volutions, dark horn-colour and glossy : 

 aperture narrow crescent-shaped, umbilicus minute. 



Helix fulva. Drap. p. 81. L 7./. 12, 13. 

 Teba fulva. Leach, Mollusc. ^5. 99. 

 Helix trochiformis. 3Iont. p. 427. t, 11./. 9. 

 Helix Trochulus. Dillwyn, p. 916. 



