Class VI. HELIX. SNAIL. 321 



** Wreaths rounded and umbilicated. 



Lin. Syst. 1243. No. 671. 



Faun. Suec. 2179- 



6. CORNEA, 



Gm. Lin. 3623. 



Lin. Tr. viii. 190. 



horny. 



List. Angl. tab. ii. Jig. 26. 



Mont. Test. Br. 448. 





Gualtieri, tab. iv. D. D. 







He. with four rounded spires ; umbilicated ; 

 of a horny appearance. 



Found in dull deep rivers, and in ponds. 

 The largest of the British depressed species. 

 Tab. lxxxvi. Jig. 3. and Jig. *3. *3. a young 

 shell. 



Gm. Lin. 3624. 



Mont. Test. Br. 455. id. 



7. SPIROR- 



Lin. Tr. viii. 191. 



Sup. t. 25. /. 2. 



BIS. 



* He. with a concave shell, both sides plane, 

 whitish, and five round volutions ; diameter 

 three tenths of an inch; inhabits stagnant 

 waters and rivulets. 



Gm. Lin. 3624. 



Mont. Test. Br. 457- id. 



8. CONTOR- 



Lin. Tr. viii. 1Q1. 



Sup. 146. t. 25. f. 6. 



TA. 



# He. with a subumbilicated shell, plane, equal 

 on both sides, with pointed linear aperture; 

 size of a cabbage seed ; inhabits rivulets and 

 ditches. 



vol. IV. Y 



>, 



