I was trying to identify this gastropod, but not able to identify it clearly, so please can anyone help me to identify this gastropod. This may belong to slipper limpet i guess. The photos of the gastropods was attached too.
The photo is not too clear, but I agree with Roger that it is Nerita of some sort. There does not appear to be strong teeth on the shelf & the shell sculpture is pretty weak. My best guess is Nerita polita based on this & the fact that shell coloration is variable and it is likely found in Tamil Nadu, but it's best you double check with some bona fide reference sources.