62 GASTEROPODA. HELICID®. 
the confluence of any two, three, four, or all the bands ; or loss 
of some band or bands, with the confiuence of other bands. 
A variety with a white peritreme is occasionally found, but 
is far from being common. 
The animal is very variable in colour ; it is usually brownish 
above, with a pale line on the middle of the back; foot pale 
yellow or testaceous. Tentacula cinereous, often tinted with 
very pale blue. 
The volutions are sometimes separated or very much pro- 
duced. I possess one in the latter state, which is figured in 
Pl. II. fig. 3; and since the plate was engraved, I have re- 
ceived another specimen which is more than twice as high. 
Longitudinal diameter aun inch. 
2. TACHEA HORTENSIS. 
T. testa glabrata, concolore 1, 2, 3, 4 aut 5-fasciata, peritre- 
mate interne albo. 
Helix hortensis, Mill. Verm. Hist. 247; Mont. Test. Brit. 
412; Drap. Hist. des Moll. 95. pl. 6. fig. 6; Plem. Edinb. 
Encycl. vii. 81; Turt. Conch. Dict. 60?; Dill. Cat. Dese. 
942, B 
Helix nemoralis var., M. and R. Trans. Linn. Soc. viii. 207. 
Habitat cum preecedente, vulgaris. 
Shell smooth, of an uniform colour, or with from one to five 
longitudinal bands. Peritreme internally white. Longitudinal 
diameter seven-eighths of an inch. 
This species is invariably smaller than Tachea nemoralis, 
from which it may be generally distinguished by the white co- 
lour of the mner aspect of its peritreme. It is subject to all 
the varieties of the preceding species. Its flesh-coloured 
variety is not unfrequently found with the peritreme of the 
same colour. 
An anatomical distinction between this species and 7. nemo- 
ralis has been discovered by my friend Mr. J. Henslow, of 
Cambridge, who is about to write a paper on the subject. 
