174 PNEUMONOBRANCHIATA. 



the shell a radiated appearance (under a magni- 

 fier) ; the outer whorl rather large in proportion 

 to the rest, under side smooth, without any 

 whiteness ; umbilicus moderately large. 



Helix striatula. Gray, Med. Repos. 1821. 239. 



radiatula. Alder, Cat. 12. n. 50.; Mag. 



Zool. fy Bot. ii. 207. ; Jeffreys, Linn. Trans, xiii. 

 511. 



Helix nitidula. Pfeiffer, Midland. 

 - j3. Drap. 



. brevipes. Turton, Man. ed. 1. t. 5. f. 50.?? 



Var. 1. Vitrina, transparent, greenish white. 



Helix vitrina. Ferussac, Prod. 



Inhab. woods, &c. in wet moss* 



Animal black. 



Shell about one twentieth of an inch in diameter. 



This species may be distinguished from the young 

 of the other Zonites by the regular and more distinct 

 striae, and particularly by the flatness of the whorls 

 at their junctions. 



This shell was first indicated as British in the 

 Medical Repository for 1821, but as it was not de- 

 scribed, Mr. Alder's name must be adopted. 



53. 10. ZONITES lucidus. Lucid Snail, (t. 4. f. 38.) 

 Shell depressed, rather convex, thin brownish 

 horn-colour, transparent, shining, finely striated, 

 whorls 4J or 5; umbilicus large, exposing the 

 second whorl ; aperture roundish. 

 Helix lucida. Drap. 103. t. 8. f. 11, 12. (not 

 Montagu] ; Brard, 34. t. 2. f. 3, 4. ; Gray, Med. 

 Repos. 1821. 239. ; Turton, Man. ed. 1. 56. f. 38, 

 (not 40.). 



