i found this on the beach in Puerto Rico last week. Can you tell me what it is? It is about 2 1/4 inches long

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I think it's a tooth (probably from some large mammal, I'd guess a molar of something like a horse) that has been really badly worn by being in the sea. The end on the left of the last picture looks just like the wear surface of a grazing mammal that has jsut had all the texture worn off leaving the very base and the root of the tooth.

Take a look at this pic for example. Plit the tooth in half and wear away the bit at the front and you'd have something pretty simialr to what is in your photos: http://www.thefossilforum.com/uploads/m … 571502.jpg