46MALACOZOA. GASTEROPODA. PULMOBRANCHIATA.TERRESTRIA. 



wrinkled, shining, transparent, yellowish-brown, with 

 the suture margin planulate, part of the last turn beneath 

 somewhat opaque and whitish, umbilicus rather large 

 and deep. Allium, garlic. Alliarius, smelling of 

 garlic. 



6. Zonites radiatulus. Shell depressed, very slightly 

 convex above, regularly striate, transparent, glossy, pale 

 greenish-grey, of three-and-a-half whorls, which are flat- 

 tened at the suture margin, with the striae more distinct 

 there, umbilicus large and deep. Radiatulus, having 

 small rays. 



7. Zonites purus. Shell flattened, somewhat convex 

 above, wrinkled or striate, transparent, moderately glossy, 

 greenish-white, of four whorls, which are a little convex 

 and incurved at the suture margin, umbilicus rather 

 large and deep. Purus, clean or clear. 



8. Zonites crystdllinus. Shell flattened, very slightly 

 convex above, extremely thin, transparent, shining, green- 

 ish-white, of five or six whorls, which are slightly flat- 

 tened at the suture margin, and faintly striato-rugose, 

 umbilicus deep, of moderate width. Crystallinus, clear 

 like crystal, or glass. 



9 . Zonites fuscus. Shell rather convex, extremely thin, 

 flexible, the turns striato-sulcate. Fuscus -, brown or 

 dusky. 



GENUS 4. VITRINA. Animal with a linguiform process 

 extending backwards over the shell, on the right side. 

 Shell spiral, of few turns, semiorbicular, imperforate, 

 extremely thin, transparent ; the last turn disproportion- 

 ately large ; the aperture roundish, with the margin very 

 thin. Vitrum, glass. Draparnaud. 



1 . Vitrina pellucida. Shell ovato-orbicular, consider- 

 ably depressed, very thin, brittle, glossy, pale apple-green, 

 or hyaline ; with the aperture very large, roundish, sub- 

 lunate. Pellucidus, permeable to light. 



GENUS 5. SUCCINEA. Shell oval or oblong, imperforate, 

 very thin, with a short spire; the aperture very large, 

 obovate or oblong, with the margin thin, and disunited 

 behind. Succinum, amber. Draparnaud. 



