58 



BULLA. 



DIPPER Class VI. 



12. FONTI- 



Gm. Lin. 3427- 



Mont. Test. Br. 226. id. 



NALIS. 



Lin. Tr. viii. 12(5. 



Sup. Q6. 



*' B. with an ovate pellucid shell; spires re- 

 versed, and faint ; aperture ovate-oblong ; 

 length half an inch ; breadth a quarter of an 

 inch. 



Running and stagnant waters. 



13. rivalis. £*w. Tr. viii. 126. Mont. Test. Br. Sup. 97. 



* B. with an oval pellucid shell ; spire reversed, 

 pointed, but little prominent; aperture ovate- 

 oblong ; length half an inch ; breadth.a quarter 

 of an inch. 



In streams in Hampshire. 



14. hypno- Gm. Lin. 3428. Mont. Test. Br. 228. 



, RUM - Lin. TV. viii. 127- 



* B. with an ovate pellucid shell; spire reversed 

 and prominent ; aperture ovate lanceolate ; size 

 of an oat grain. 



In ponds and ditches about London and 

 elsewhere. 



