Oh, it's a one-off species called a "felinoid" that never appeared again.

That's actually better. It was going to be worse if they had a Kzinti crew member. I fricken' hate how they did that. I encountered the Kzinti in Starfleet Battles, and was baffled why they were there. I was like, "They're not a Star Trek race!" But then people were like, "Kzinti are cool, what's your problem?" Reruns of TAS weren't on TV and we didn't have the entire archive of old TV on demand like we do now.