AMPULLARIA. 3 



taken in by the siphon. This organ has great 

 extensibility, and is frequently protruded above 

 the water to take in air. Whilst it is passing 

 through the water the extremity is closed, and 

 in its passage bubbles are frequently expelled. 

 The palpi are constantly used as tactual organs, 

 and the tentacles also to some extent. 



The food of these animals is vegetable, and 

 the cultivated lettuce was eagerly devoured by 

 A. depressa and an exotic species. The latter, 

 when eating anything which was long and 

 slender, would commence at one end and retain 

 its hold until the whole were swallowed. If 

 the piece were too thin to supply it fast enough, 

 the animal would double it about the middle, 

 and thus gradually draw in double the quantity. 

 These two species were in vessels within doors, 

 and were most active at night, seldom exposing 

 the body during the day. They resemble the 

 Physada3 in gliding over the edge of the vessel 

 in which they are kept. 



OBSERVATIONS. 



If this genus is hydropneumonobranchiate, it 

 is not far removed from Amphibola, which forms 



