MALACOZOA. GASTEROPODA. PULMOBRANCHIATA. 89 



wrinkles ; generally pale yellowish-brown or yellowish-grey or 

 horn-colour, sometimes variegated with a lighter tint ; the 

 whorls well defined, the last rounded ; the mouth oblique, semi- 

 lunate ; the lower surface generally paler, and more or less 

 tinged with a somewhat opaque milky or opaline white. In 

 very dry situations, the shell is thicker, often firm, somewhat 

 opaque and of a pale horn-colour ; in moist situations, often very 

 thin, fragile, and yellowish-brown, always however paler than 

 Zonites nitidulus. When long dead, it becomes opaque white. 



The animal is of a pale grey or greyish-white colour, with 

 the tentacula purplish-grey or dull lilac, the upper marked 

 with a dusky shade ; the eyes blackish ; the foot extremely 

 thin, linear beneath, and pointed behind. 



Common in damp shady places, by walls and hedges, 

 and among stones, chiefly near the sea-coast. I have not found 

 it far in the interior. Very abundant below stones, among 

 grass and nettles, and in the buildings, among the ruins of 

 Dunottar Castle. Plentiful about Old Aberdeen ; at Delgaty, 

 and Banff, where it was found by Miss Macgillivray. 



Helix cellaria. Muller, Verm. Terrestr. et Aquat. ii. 28. 

 Helix lucida. Mont. Test. Brit. 425. PL 23. f. 4. Helix nitida. 

 Drap. Moll. 117. PI. 8. f. 23, 24, 25. Helix cellaria. Lamk. 

 Syst. Ed. 2. viii. 71. Zonites cellarius. Gray's Turton, 170. 

 Helix nitida. Flem. Brit, Anim. 262. 



3. Zonites nitidulus. Nitidulous Zone-Snail. 



Shell depressed, considerably convex above, somewhat 

 wrinkled, transparent, glossy, light yellowish-brown, of five 

 whorls, which are direct arid slightly convex at the suture- 

 margin, and of which the last has a small part of the under 

 side along its inner margin whitish and very slightly opaque ; 

 the umbilicus rather large and deep ; the aperture oblique, 

 subelliptical, longer than broad, Diameter four-twelfths of 

 an inch, height nearly ten-twelfths. 



This species is so nearly allied to Zonites lucidus that a not 

 very careful collector might readily confound them. It is 

 smaller than Zonites cellarius, of a richer colour, generally yel- 

 lowish-brown, with a kind of waxy appearance in light reflected 

 from its interior, of a duller external gloss, higher in proportion 

 to its breadth, and with the whorls not bent at the suture- 

 margin, so as to form a flattened or concave space. There is 

 comparatively very little opacity or whiteness on the lower 

 surface, and only along the inner part of the whorl ; the um- 

 bilicus is a little larger, and the mouth less obliquely placed. 

 H 2 



