86 MALACOZOA. GASTEROPODA. PULMOBRANCHIATA. 



distinctly separated by the suture ; the base rather convex, with 

 a shallow undefined umbilicus, encroached upon by the peri- 

 stome ; aperture semilunar, oblique, with the margin thin, but 

 reflected and a little thickened near the umbilicus ; the colour 

 olivaceous, or deep yellowish-grey. Diameter a tenth of an 

 inch or somewhat more, height nearly the same. 



Found by me, in April, 1842, among moss in the Links 

 near Don-Mouth, along with Bulimus lubricus, Helix pulchella, 

 and Vitrina pellucida ; also on the Banks of the Don, near the 

 Old Bridge. In September found by Mr. Leslie near In- 

 verury; in August and September by Miss Macgillivray in 

 the Den of Auchmedden, and at Delgaty. 



Helix fulva. Drap. 81. T. 7. f 12-13. Helix Trochulus. Mul- 

 ler, Verm. Terr, et Fluv. ii. 79. ? Helix trochiforrais. Mont. Test. 

 Brit. 427. PI. 1 1. fig. 9. Helix Trochulus. Flem. Brit. Anim. 260. 

 Helix fulva. Gray's Turton, 148. PI. 5. f. 47. 



This evidently is not Helix fulva of Muller, which he de- 

 scribes as attaining a diameter of three lines, with the tip acute 

 and white, and the whorls seven. 



7. Helix lamelldta. Lamellate Snail. 



Shell conico-convex, with six whorls, which are well rounded, 

 thin, semitransparent, glistening or sattiny, with numerous, 

 regular, thin, lamellae, and very distinctly separated by the 

 suture ; the base convex, with a small but deep umbilicus ; 

 aperture narrow crescent-shaped, thin ; the colour reddish- 

 brown. Diameter a twelfth of an inch, height nearly the same. 



Distinguishable from Helix Trochulus by its laminae, umbili- 

 cus, less convex and regularly tapering spire. 



Found by Mr. Dickie, the most distinguished of our botanists, 

 in the Den of Rubislaw, on leaves of the Acer Pseudo-platanus. 

 Both he and Mr. Cruickshank have favoured me with speci- 

 mens. 



Helix Scarburgensis. Turton, Land and Fresh Water Shells, 

 Ed. i. 162. Helix lamellata. Jeffreys, Linn. Trans, xvi. 333. 

 Helix lamellata. Gray's Turton, 150. PI. 5. f. 48. 



8. Helix aculedta. Prickly Snail. 



Shell globoso-conical, with five whorls, which are rounded, 

 thin, semitransparent, glistening, with a longitudinal series of 

 oblique pointed laminae ; the suture deep ; the base convex, 

 with the umbilicus moderate ; the aperture roundish-lunate ; 

 the colour greyish-brown. Diameter about the tenth of an inch. 



Found by Mr. Dickie, in the Den of Rubislaw. 



