Class VI. TURBO. WREATH-SHELL. 303 



Lin. Tr. viii. l6g. 460. vign. 1. y. 78. ic?. £wj». 30. crista- 



H. cristata. Mont. Test. Br. 147. Tws « 



* T. shell planish above, umbilicated beneath, 

 with three or four round volutions; minute; 

 inhabits fresh water. 



In the river Avon in Wiltshire, and near 

 Sandzvich. 



Lin. Tr. viii. 170. Mont. Test. Br. 43g. t. 13. 31. depres- 



/. 5. sus - 



* T. with a depressed shell, umbilicated beneath, 

 four volutions, aperture orbicular ; minute ; in- 

 habits the sea. 



Found only by Mr. Montagu in Cornwall 

 and Devonshire. 



Gm. Lin. 3592. Mont. Test. Br. Sup. 137. 32. calcar. 



t. 2Q. f. 3. 



* T. with an unbilicated depressed shell, of a 

 pale pink color, four volutions, the first fur- 

 nished with about thirteen large erect processes; 

 diameter one quarter of an inch. 

 Taken by Mr. Laskey in Jona. 



