Add shrimp to boiling liquid in pan; cook 2 minutes or until done. Remove shrimp from pan with a slotted spoon, and add to mussels. Cut squid crosswise into 1/4-inch rings, and leave tentacles whole. Add squid to boiling liquid in pan; cook for 1 minute. Remove the squid from pan with a slotted spoon. Cool; add squid to mussels mixture. Add lobster to pan, and cover, reduce heat, and simmer for 8 minutes. Remove lobster from pan, reserving 1 tablespoon cooking liquid; cool lobster. Remove meat from lobster tail and claws; coarsely chop. Add lobster, salt, and black pepper to mussels mixture.