34 HELICIDiE. 



obliquely crescent-shaped, manifestly descending at its 

 base, below the general levels of the disk, not quite 

 so high as broad, equal in width to nearly half the total 

 diameter. Peristome thin, simple, not reflected. Base 

 not much rounded, more distinctly wrinkled than the 

 upper surface ; umbilicus moderately large, exposing the 

 second whorl. Diameter two-fifths of an inch. 



Although Miiller describes the animal as " Limax totus 

 albus," that is not the usual appearance of it, especially 

 when taken in the fields. It is of a bluish-white hue 

 with dark violet head, neck, and tentacles. The upper 

 tentacles are long and slender, and bear the eyes within 

 a pale space at their swollen tips. The foot is marginated. 

 The tail slightly exceeds the shell and is gently truncated 

 obliquely at its extremity. 



This species is universal through the British Isles, 

 living in houses, under stones, in drains, and among 

 grass. 



Z. alliarius, Miller. 



Resembling cellaria, but much smaller, more convex, of only 

 four volutions, not so pallid, merely opaque white near the 

 umbilicus. 



Plate CXX. fig. 5, 6. 



Helia alliaria, Miller, Ann. Philos. new ser. vol. iii. p. 379- — Alder, Trans. 



Nat. Hist. Soc. Northumb. vol. i. p. 37 ; — Mag. Zool. and Bot. 



vol. ii. p. 108. — Turton, L. and F. W. Shells, p. 56, f. 39, 



(very badly). — Brown, Illust. Conch. G. B. p. 52. — Chemn. 



(ed. Kiist.) Helix, No. 508, pi. 83, f. 10, 11, 12.— L. Pfeif. 



Monog. Helig. vol. i. p. 90. 

 „ glabra, Studer in Ferus. Prodrom. Moll. 215. — Charpent. N. Dinkscli. 



Schweiz. Ges. Nat. vol. i. (1837), p. 13, pi. 1, f. 22 (Hyalinia). 



— Rossmassl. Iconog. Land und Siissw. Moll. pt. 8, p. 36, 



f. 528. 

 ., dUiacea, Jeffreys, Trans. Linn. Soc. vol. xvi. p. 341. 



