54 



AMPULLARIA. 



Family AMPULLARIIDAE. 



Fig. 91. 



[Lingufil membrane with seven series of teeth (3, 1, 3), 

 central teeth acute, lateral, subulate. Rostrum divided into 

 two long tentacular lobes in front; tentacles long and fili- 

 form ; eyes on peduncles at the outer bases of the tentacles. 



Mantle with a more or less elon- 

 gated siphon on the left side 

 in front; left gill rudimentary; 

 mantle cavity with a large pul- 

 monary sac on each side. Rec- 

 tum not traversing the heart. 

 Foot simple. Operculum annu- 

 lar, regular. Shell spiral, tur- 

 binate, covered with an oliva- 

 ceous epidermis; ajDcrture sim- 

 ple in front. 



The Ampullariidse are fluvia- 

 tile,. and represent in the ponds 

 and rivers of the tropics the 

 Vivi2Mrid8e of more temperate 

 climates. Although distinct gills 

 exist, the respiratory cavity is 

 very large and partly closed, so as to enable these animals 

 to live a long time out of water; in fact, they appear to be 

 truly amphibious, and to be enabled to survive a long drought, 

 and have been known to revive after having been kept seve- 

 ral years out of water. The long siphonal tube appears to 

 be formed by the left neck-lappet, which is seen in the Vivi- 

 XMridse in a rudimentary state. — H. & A. Ad^ 



Animal of ^. depressa, reduced 

 one-half. 



Fig. 92. 



A1T1PUI.L.ARIA, Lam. 



[Siphon elongate. Operculum horny, dex- 

 tral. Shell dextral, globose, widely umbili- 

 eated, last whirl very large, ventricose ; 

 spire short; aperture entire, oblong, large, 

 expanded, peritreme simple, always thin, 

 sometimes subreflexed. Pomus, H. & A. 



Operculum of A. depressa. -ACI. J 



