Class VI. HELIX. SNAIL. 327 



Lin. Tr. viii. 200. Mont. Test. Br. 42?. t. 11. 24. trochi- 



f. Q. id. Sup. U5. roRMis. 



* He. with a subumbilicated, subconic, smooth 

 shell; aperture somewhat crescent - shaped, 

 transversely compressed; diameter one eighth 

 of an inch. 



Found in decaying trunks of trees. > l^ 



Helix aculeata. Gm. Lin. Mont. Test. Br. 42Q. t. 11. 25. spinu- 



3638. /. 10. ^OSA. 



Lin. Tr. viii. 201. 



* He. with a subconic umbilicated shell, having 

 five convex volutions -, girt with acute membra- 

 naceous ringlets ; the back ridged with minute 

 spines ; aperture suborbiculai' ; minute. 



Found among mosses. ^ 



Lin. Tr. viii. 201. Mo7it. Test. Br. 428. t. 13. gg. LACUNA 



f.6. 



* He. shell subglobose and umbilicated, with 

 smooth tumid volutions ; pillar grooved ; dia- 

 meter a quarter of an inch j inhabits the sea. 



