170 PNEUMONOBRANCHIATA. 



in one it was faint, and in the other it was not per- 

 ceptible. It would appear, therefore (he continues), 

 that the animal has the power to retain or emit its 

 peculiar odour at pleasure; and that in death its 

 emission may be prevented by accidental circum- 

 stances : he thinks it arises from the yellow fluid 

 pressed out about the head. 



49. 6. ZONITES cellarius. Cellar Snail, (t. 4. f. 40.) 

 Shell flat, pale yellowish horn-colour, transpa- 

 rent, shining, very slightly wrinkled, with 5 or 

 5J whorls ; the under side clouded with opake 

 white; umbilicus moderately large, exposing the 

 second whorl. 



Helix cellaria. Mutter, Verm. 28. ; Lam. Hist. vi. ; 

 Alder, Cat. 12. n. 47.; Mag. Zool. * Bot. ii. 

 208. 



Helix nitida. Drap. Moll. 117. t. 8. f. 23. 25. ; 

 Brard, 31. t. 2. f. 2. 



Helix nitens. Maton and Racket, Linn. Trans. 

 viii. 198. t. 5. f. 7.; Ferussac, Prod. 



Helix lucida. Montag. T. B. 425. t. 23. f. 4. ; 

 Turt. Man. ed. 1. f. 40. 



Zonites lucida. Leach, Moll. 10. 



Inhab. under stones in fields and woods, and in 

 cellars and yards in cities. 



Animal pale grey, white when young. 



Shell rather less than half an inch in diameter, 

 but sometimes growing to nearly three quarters of 

 an inch, glossy and irregularly 

 striate, with 5 or 5J volutions, 

 which are well defined by the 

 suture ; underneath milky-white, 

 especially about the umbilicus, which is large and 



