Yes, BELEMNITES is a Scrabble word!

Letter values in Scrabble US: B 3, E 1, L 1, E 1, M 3, N 1, I 1, T 1, E 1, S 1.

Is it a valid word?

BELEMNITES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a conical calcareous fossil tapering to a point at one end and with a conical cavity at the other end containing (when unbroken) a small chambered phragmocone from the shell of any of numerous extinct cephalopods of the family Belemnitidae