On that cruise we were just on, they had unlimited grilled lobster tail for every lunch & dinner (buffet dining, not the main dining room). I'm not a big fan of lobster, but Lew ate so much I was waiting for him to grow claws & feelers/antennae (not sure what they call those things on lobsters)!
Lobsters have both antennae and antennules. The claws are chelae.