272 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXII. 



Fig.l. 



Jla;. 1 



Anothei' species in the collection is Maeroehlamys 'p^ina, Benson 

 al&o a common Bombay snail, belonging, ^%iXh Ariophanta, to the 

 family Limacidce. 



Otlier well-known families of the order,- as yeit tinrepresente-d, are 

 Bdiddce, Stenogyridce and Ihcpidce (land), lAmncBidcB (freshwater) 

 and AuriouUdce (brackish). 



While most of the radnlae of the pnlmonates have a general 

 resemblance one with another, an infinite vtiriety of detail will be 

 found on comparing the different genera. Some of the camivoroiis 

 genera possess sickle-shaped teeth, somewhat resembling those of the 

 marine genns lanthina (see fig. 10). 



The non-carnivorous genera possess, in addition to the radula, a 

 curved mandible placed behind the upper lip of the mouth ; this 

 is used for biting their food, while the radula would appear to be 

 used for grating up the particles as they are swallowed. 



2. Order OpisthobrancJiiata.—This order \vhich includes amongst 

 otliers the nudibranchs, the limpet-like Siphonaria and the Bidloidea 

 is not represented in the collection. 



3. Order Prosohranchiata.— The families in this order, to which 

 most of the better known marine molluscs and the land and fresh- 

 water operculates belong, may be conveniently classified by their 

 radulae as follows : — 



(a) Toxoglossa (roiov ■== arrow) 



