.312 TURBO. WREATH-SHELL. Class VI. 



Not common ; but found in Wiltshire, Dor- 

 setshire, Devonshire, and Cornwall. 



55. TRIDENS. Gm.Lin.3Qil. Mont. Test. Br. 338. t. 11. 



Lin. Tr. viii. 181. /. 2. id. Sup. 125. 



* T. with a subcylindric smooth shell; six or 

 seven somewhat plane volutions ; aperture with 

 three teeth ; length a quarter of an inch. 



Found on water plants, by the river Stour, 

 Dorsetshire. 



$Q. juni- Lin. Tr. viii. 182. Mont. Test. Br. 340. t. 12. 



PERI. 



/• 12- 



* T. with a subcylindric shell; obliquely stri- 

 ated volutions ; aperture with seven teeth ; 

 length scarcely half an inch. 



Found on the roots of juniper, in Wiltshire 

 and Dorsetshire ; rare. 



57. musco- Gm. Lin. 3611. Mont. Test. Br. 335. id. Sup. 



RUM. Lin. Tr. viii. 182. t. 22. f. 3. 



* T. with an ovate obtuse pellucid shell; six 

 volutions inclined to one side; aperture plain 



