MALACOZOA. GASTEROPODA. PULMOBRANCHIATA. 95 



aperture large, roundish, sublunate ; the lip thin, the pillar- 

 cavity small ; the whorls convex, rapidly diminishing to an 

 obtuse point ; their substance very thin, brittle, pellucid, 

 glossy, pale apple-green or hyaline, sometimes partially 

 opaque and whitish. Breadth three-twelfths ; height a twelfth 

 and a-half. 



The animal light-grey, with the head and tentacula black- 

 ish : when young, very active, and incapable of withdrawing 

 entirely w r ithin the shell ; but when full-grown, as I have ob- 

 served, it can withdraw itself completely. Very common 

 among moss, in the shelter of whins or broom, and under 

 stones, in dry as well as moist places, near the coast, and 

 in the interior. Vast numbers are destroyed by insects, and 

 little heaps of the empty shells are frequently met with. It 

 extends far into the Highland valleys, being found, for ex- 

 ample, in Glentannar and Glenmuick. 



Vitrina pellucida. Flem. Phil. Zool. ii. PI. 24. f. 1. Helix 

 elliptica. Brown, Wern. Mem. ii. 525. PI. 24. f. 8. Vitrina 

 pellucida. Gray's Turton, 120. Helicolimax pellucida. Feruss. 

 Hist. Moll. PL 9. f. 6. Vitrina pellucida. Flem. Brit. Anim. 

 Vitrina pellucida. Drap. Hist. Mol. 119. PL 8. f. 34-37. 

 Vitrina pellucida. Lamk. Syst. vi. 2. 53; Ed. 2. vii. 728. 



GENUS 5. SUCCINEA. AMBER-SNAIL. 



Animal with the body ovato-oblong, slightly spiral 

 at the end ; four short flattened tentacula ; the foot very 

 large, oblong, flat beneath. 



Shell oval or oblong, very tliin, with a short spire ; 

 the aperture very large, obovate or oblong, with the 

 peristome thin, and disunited behind, the pillar imper- 

 f orate. 



The Succinese, so named from the colour of the 

 shell, which has some (very remote) resemblance to 

 that of amber, succinum, live in damp places, marshes, 

 and the grassy or mossy margins of rills. 



1. Succinea piitris. Oval Amber-Snail. 



Shell ovato-oblong, very thin, transparent, glossy, striated, 

 light brownish-yellow ; whorls three ; the spire short ; the 

 mouth vertical, ovate, two-thirds of the whole length, poste- 

 riorly acute k the margin very slightly tiiickened and blunt. 

 Length from half an inch to eight-twelfths. 



Animal vrith the foot elliptical, oblong, yellow or yellow- 



