However, you might be thinking of:
* Cephalopods: These are sea creatures like octopuses, squid, and cuttlefish. They have eight arms, which are technically tentacles, and two longer tentacles they use for hunting.
* Arthropods: Many arthropods, like crabs and lobsters, have ten legs that might appear like arms, but they are actually walking legs.
Let me know if you had something else in mind, and I'll do my best to help!