Shares transfer in case of death

Devendra (Chartered Accountant) (4775 Points)

14 August 2013  

Mr. X is the Grandson of Mr. Z and Mr Y is the son of Mr. Z. Mr. Z and Mr. Y are no more. Whereas shares are still in the name of Mr. Z. And now Mr. X wants to transfer the shares to his own name, but some of the share certificates are missing. 

What is the procedure to transfer the shares to Mr. X's name?

What all documents will be required in the above case?