The Collaborative International Dictionary of English v.0.48:

Lobster pot \Lob"ster pot\, n.
   a device used to trap lobsters, consisting of a
   semi-cylindrical structure made of wooden slats, with
   openings formed of funnel-shaped nets allowing lobsters to
   enter, but impeding their exit. It is also called a lobster
   trap.
   [PJC] Lobster thermidor

The Collaborative International Dictionary of English v.0.48:

Lobster trap \Lob"ster trap\, n.
   same as lobster pot.
   [PJC]