92 MALACOZOA. GASTEROPODA. PULMOBRANCHIATA. 



the striae more distinct there, the last whorl proportionally 

 large ; the umbilicus large and deep ; the aperture oblique, 

 lunate, as broad as long. Diameter nearly three-fourths of a 

 twelfth, height half the breadth. 



It differs from Zonites crystallinus in being less highly 

 glossed, more regularly and strongly striate, of a duller co- 

 lour, with the last turn proportionally double the size. It re- 

 sembles the young of Zonites lucidus, but is less convex, 

 paler, more striate, and more glossy. 



First found by me, on the 5th of July, ] 842, among de- 

 cayed leaves in a damp place under the shade of trees, 

 near Seaton House ; in September, by Mr. Leslie, near In- 

 verury ; by Miss Macgillivray, at Delgaty, Parish of Turriff, 

 and in the Den of Auchmedden. 



Helix radiatula. Alder. Cat. 12: Mag. Zool, and Bot. ii. 

 270. — Zonites radiatulus. Gray's Turton, 174. — Helix nitidulus. 

 var. 3. Drap. PL 8. f. 21,22. 



7. Zonites purus. Clear Zone-Snail. 



Shell flattened, somewhat convex above, wrinkled or 

 striate, transparent, moderately glossed, greenish-white, of 

 four whorls, which are a little convex and incurved at the 

 suture-margin, and of which the last is proportionally large, 

 not thickened or opaque beneath ; the umbilicus rather large, 

 and deep ; the aperture oblique, longer than broad, subellip- 

 tical. Diameter two-twelfths of an inch, height rather more 

 than half the breadth. 



It resembles Zonites nitidulus in form, but differs in being 

 of a different and paler colour, in having the mouth less ob- 

 lique, and in its much smaller size. 



Animal bluish-white, with the tentacula pale lilac or bluish, 

 the mantle variegated with dusky. 



First found by me and Miss Marion Macgillivray, on the 

 27th June, 1822, about stumps of felled trees, in moist 

 ground, in Seaton Park. In September found by Mr. Leslie 

 near Inverury ; by Miss Macgillivray at Gamrie, in Banff- 

 shire, and in the Den of Auchmedden. 



Helix pura. Alder. Cat. 12. — Zonites purus. Gray's Turton, 171. 



8. Zonites crystallinus. Crystalline Zone-Snail. 



Shell flattened, very slightly, convex above, extremely thin, 



transparent, shining, greenish-white, of five or six whorls, 



which are moderately convex above, slightly flattened at 



the suture-margin, and faintly striato-rugose ; the t\irns re- 



