EXPLANATION OF PLATE I. 



Vivipara bengalensis (Lamarck), forma typica. 



Fig. I. — Normal shell from Rajmahal, Bengal. 

 Actual height 35 mm. 



2. — Shell of the elongate type from Calcutta. 

 Actual height 40 mm. 



,, 3. — Shell of the gigantic type from Dinapur, Bihar. 

 Actual height 48'5 mm. 



Vivipara bengalensis mandiensis , Kobelt. 



Fig. 4. ^Shells from type -series from Mandi State, Kangra valley 

 W. Himalayas. 

 Actual height 34"5 mm. 



,, lO.^Shell of semi-albino phase from Lahore, Punjab. 

 Actual height 30 mm. 



Vivipara bengalensis colairensis, subsp. nov. 



Fig. 5.— Shell of t.ype-.specimen from pond at the edge of the 

 Colair Lake, Ellore Dist., Madras Presidency. 

 Actual height 39 mm. 



,, 6. — Shell of elongate type from the same series. 

 Actual height 48 mm. 



Vivipara bengalensis nepalensis, Kobelt. 



Fig. 7. — Shell from the type-series from Chonebal, Nepal. 

 Actual height 28-5 mm. 



Vivipara bengalensis balteata (Benson). 



Fig. 8.— Shell of the obese ("Normal") type from Fenchuganj, 

 S)-lhet, Assam. 

 Actual height 25'6 mm. 



Vivipara bengalensis doliaris (Gould). 



Fig. 9. — Shell of extreme type from Mandalay, U. Burma. 

 Actual height 24'5 mm. 



