88 MALACOZOA. GASTEROPODA. PULMOBRANCH1ATA. 



feed on vegetable substances, and reside in damp or 

 shaded places, as under stones, or among grass or moss. 



1. Zonites rotunddtus. Radiated Zone-Snail. 



Shell flattish, slightly convex above, deeply and regularly 

 sulcato-striate, variegated with undefined spots of reddish-brown 

 and greyish-yellow ; the umbilicus very large, exposing all the 

 turns ; the lower surface more glossy and less strongly striate ; 

 the whorls six, convex, the last slightly angulate ; the aperture 

 semilunar, oblique. Diameter four-twelfths of an inch. 



This species, easily distinguishable by the deep transverse 

 striae on the whorls, varies in the degree of convexity of the 

 spire, and in its colours, although it is generally marked in 

 a somewhat radiating manner with spots of brown and yel- 

 lowish-grey or whitish, or of dusky-brown and reddish-grey. 



The animal is of a pale bluish-grey colour, anteriorly tinged 

 with green, and spotted above with whitish. 



Very abundant under stones, on walls, among grass and 

 other herbage, in dry and moist places, on dead leaves and 

 decayed wood, in short in a great variety of situations, along 

 the coast and in the interior. Ruins of Dunottar Castle, rub- 

 bish of Saltworks in the Bay of Nigg, about Old Machar 

 Cathedral. About Slains Castle, and the Bullers of Buchan. 

 Also in the interior, as far as theHighland valleys. Den of 

 Auchmedden, Delgaty, Banff, and Turriff ; Miss Macgillivray. 



Helix rotundata. Drap. Moll. 1 14. PL 8. f. 4, 5, 6, 7. Helix 

 rotundata. Muller, Verm. Teriestr. et Aquat. ii. 29. Helix 

 radiata. Mont. Test. Brit. 431. PL 24. f. 3. Helix rotundata. 

 Lamk. Syst. Edit. 2. viii. 74. Helix rotundata. Flem. Brit. 

 Anim. 263. Helix Turtoni. Flem. Brit. Anim. 260. Zonites 

 rotundatus. Gray's Turton, 165, 



2. Zonites celldrius. Cellar Zone-Snail. 



Shell flattened, slightly convex above, somewhat wrinkled, 

 shining, transparent, pale yellowish-brown or yellowish-grey, 

 of six whorls, which are slightly depressed at the suture-margin, 

 and of which the last has a large extent of the under side 

 somewhat opaque and whitish ; the umbilicus rather large and 

 deep ; the aperture oblique, semilunar of about equal length 

 and breadth. Generally five or six, sometimes eight-twelfths. 

 in diameter; height a third of the breadth. 



This, the largest of our Zonitse, has the shell highly glossed, 

 marked with faint, but sometimes strong irregular convex 



