GASTEROPODA. HELICIDZ. 63 
STIRPS III. 
Synopsis Generum. 
Peritrema interne marginatum ; posticé tenu- 
eM MUCHAARIND 3: ectace! Voosiic aa czige aj? 20s ARRANRA. 
Peritrema crassius; posticé nullum........ 27. Pomatia. 
Genus 26. ARIANTA. 
Testa subsolida, subglobosa, inzequilateralis. Peritrema 
interne marginatum, posticé tenuiter inchoatum. Umbilicus 
minimus. Lpiphragma membranaceum. 
Shell rather solid, somewhat globose, inequilateral. Peri- 
treme margined, only rudimentary behind. Umbilicus very 
small. Epiphragm membranaceous. 
1. ARIANTA ARBUSTORUM. 
A. anfractibus convexiusculis, pallidé fulvo-castaneis fusco- 
marmoratis, longitudinaliter unifasciatis, peritremate albo. 
Helix Arbustorum, Linn. Syst. Nat. xii. i. 1245; Mill. Verm. 
Hist. 248; Penn. Brit. Zool. iv. 136. pl. 85. fig. 130; 
Mont. Test. Brit. 413; Drap. Hist. des Moll. 88. pl. 5. 
fig. 18; M. and R. Trans. Linn. Soc. vii. 202 ; Flem. Edinb. 
Encycl. vii. 81 ; Dill. Desc. Cat. 924 ; Turt. Conch. Dict. 56. 
Cochlea unifasciata, Da Costa, 75. t. 17. fig. 6. 
Habitat in nemoribus et pratis humidis, frequens. 
Shell with slightly convex whorls, marbled with fuscous, and 
marked with one longitudinal band of fuscous. Peritreme 
white. Longitudinal diameter an inch. Height variable. 
Arianta Arbustorum differs from all its known exotic con- 
geners in the specific character given above. It is subject to 
very great variation in height and size. In mountamous and 
granitic districts it often occurs of nearly half the usual size. 
The longitudinal band is often faint ; but I have very rarely 
found it wanting. It occupies the middle of the last whorl, 
and the apparent bases of the other whorls. 
This species inhabits low meadows and groves. It is found 
in most parts of Britain, and is very abundant in the marshes 
round London, and near Cannon Mills, Edinburgh. In this 
