48 BRITISH MOLLUSKS. 



The animal is mostly of a lead-blue colour, varying to clingy 

 yellow. 



• ■■ ,fe 



2. Zonites alliaria. Garlic Zonites. 



Shell ; narrowly deeply umbilicated, convexly orbicular, transpa- 

 rent horny, inclined to glassy, whorls five, slopingly 

 convex, obscurely plicately striated ; aperture ob- (*Z^>~\ 

 liquely lunar. 



Helix alliaria, Miller (1822), Ann. Phil. New Series, vol. viii. 

 p. 379. 



Helix glabra, Stucler (1822), Feruss. Tall. Syst. p. 45. 



Helix miens, Sheppard (1825), Trans. Linn. Soc. vol. xiv. 

 p. 160. 



Helix fcetida, Stark (1828), JElem. Nat. Hist. vol. ii. p. 59. 



Helix alliacea, Jeffreys (1830), Trans. Linn. Soc. vol. xvi. p. 341. 



Helicella alliaria and glabra, Beck (1837), Ind. Moll. p. 6, 7. 



Polita glabra, Held (1837), Lsis, p. 619. 



Zonites alliarius, Gray (1840), Turt. Man. p. 168. 



Zonites (Aplostoma) alliarius and glaber, Moquin-Tandon (1855), Hist. 

 Moll. pp. 80, 83, pi. 9. f. 3 to 11. 



Hob. Throughout Europe (in gardens, among leaves and under stones). 



The names that have been given to this species well express its 

 distinctive characters ; it is particularly smooth and shilling, and 

 the mucous secretions of the animal give out a fetid odour of garlic. 

 Mr. Jeffreys remarks that this smell is very strong and pungent, es- 

 pecially when the animal is irritated. "I have perceived it," he says, 

 " at a distance of several feet from the spot. Having found living 

 specimens under stones in a bed of wild garKc, I thought at first 

 that they might have fed upon this herb and have thus acquired the 

 peculiar odour ; but I afterwards observed that this scent was quite 

 as powerful in specimens collected on an open clown where there 

 was no garlic." Dr. Johnston and Mr. Norman have both, how- 

 ever, borne testimony that the scent varies in intensity and is some- 

 times little perceptible, even after considerable irritation of the 

 animal. 



Compared with Z. cellarius, the shell is smaller, and composed 

 of a whorl less, with the spire rather more convexly raised, but 

 the whorls are broader in proportion, and it results from their more 

 contracted coiling that the shell is less widely umbilicated. 



