I'm planning on connecting the drain of a newly installed sink and I
know I need the tail pipe and p trap but I need to connect to the
existing drain pipe. The house was built in the northeast US in 1965.
Can anyone PLEASE identify the type of connector required to mate up
to this drain? http://www.fdcx.net/pix/drain.jpg

It appears that there might be a piece of the old drain still
inserted. What is recommended to make this connection?

Thanks all - signed (NOT a plumber but too cheap to call one)