Dear Rajender,

Last two looks like Apple Snail, Pila globosa, just check spire position n freshwater origin

All the best

Dr.Sethi

Dear Colleague,

the first specimen can be Cantharus.

Second specimen is a freshwater species, Viviparidae or Ampullariidae. You can use the key to Indian freshwater molluscs to identify this speices: http://faunaofindia.nic.in/PDFVolumes/hpg/005/index.pdf 

What about the possibility of Bellameya sp for the second one. 

Bellamya bengalensis is probably the second one, while Cantharus tranquebaricus is the first.

Thhank u Sir

Dear Rajendar,

I think I agree with Dr. Kebapci, the first is Cantharus tranquebaricus, whilst the second is a freshwater of genus Filopaludina, fam. Viviparidae. 

Thank you so much

2nd one is Bellamya bengalensis maam

The first is Cantharus traquebaricus (Gmelin, 1791).

But the second seems Viviparus viviparus of Linnaeus.

Dear Roberto Ardovini,

Viviparus vs. Bellamya. Please check apex of spire for immediate recognition. Suture shape and whorl angle would also help.

V. viviparus is not present beyond Palearctic realms.

All the best,

Ümit