129 



with an elongate pointed spire : aperture oval- 

 lanceolate. 



Physa Hypnorum. Drap. p. 55. t. 3.f. 12, 13. 



Limnea turrita. Sowerhij, Gen.f. 10. 



Bulla Hypnorum. Mont. p. 228. 



Nauta Hypnorum. Leach^ Mollusc, p. 152. 



Shell half an inch long, and a third part as broad, 

 dark horn-colour, glossy and transparent : spire 

 composed of five or six produced and hardly 

 raised volutions, ending rather acutely : aperture 

 narrow-oval, covering about half the shell ; the 

 pillar a little sinuate, often of a pale rose-colour. 



In ponds and slow streams. 



