GASTEROPODA. HELICID. 61 
the specimen figured in Pl. II. fig. 2. He found it in Devon- 
shire, and was kind enough to communicate it to me im a living 
state. Diameter of the shell an inch and a half. 
In the young state, like its congeners, it possesses a perfo- 
rated umbilicus, which is perfectly closed in the adult shell. 
The internal spicula are rarely more than a quarter of an 
inch in length. 
Upper part of the animal generally of a green colour, more 
or less tinged with blackish. Under parts pale grey or ash- 
coloured, sometimes tinted with pale green. Tentacula ash- 
coloured. yes black. 
Genus 25. TACHEA. 
Testa subsolida, subglobosa, inzequilateralis. Peritrema 
interné marginatum, externé subreflexum, posticé tantum in- 
-choatum. Tentacula tenuia, elongata. 
Shell rather solid, subglobose, inequilateral. Peritreme 
margined within, subreflexed without, only commenced behind. 
Umbilicus none. Tentacula slender, elongate. 
1. TACHEA NEMORALIS. 
T. testa glabrata, concolore vel fasciis 1, 2, 3, 4, aut 5 ornata, 
peritremate interné perfusco. 
Helix nemoralis, Linn. Syst. Nat. xii. i. 1247; Penn. Brit. 
Zool. iv. 137; Mont. Test. Brit. 411; M. and R. Trans. 
Linn. Soc. vin. 206; Drap. Hist. des Moll, 94. pl. 6. figs. 
3-5; Dill. Dese. Cat. 942, a; Turt. Conch. Dict. 59. 
Habitat in agris, campis, nemoribusque, vulgaris. 
Shell smooth, of an uniform colour, or longitudinally banded 
with from one to five bands. Peritreme internally deep-fus- 
cous. 
Colour white, yellow, reddish, flesh-red, livid, chestnut, 
pale-fuscous or luteous. 
It has usually five bands of deep fuscous or chocolate-brown, 
any of which may be found wanting, or confluent. This spe- 
cies, in short, is subject to every variety that can arise from 
the wanting of one, two, three, four, or all the bands; from 
the wanting of one or more of any particular bands; or from 
