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glBufferSubData usage

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I'm trying to use glBufferSubData, but I'm not getting correct results. I have a 512x512 piece of terrain and I want to update vertices 0-33. So I call glBufferSubData(GL_ARRAY_BUFFER_ARB, 0, 33, buffer), where buffer contains a pointer to the updated vertex information. But this only updates the first 4 vertices. I then tried changing 33 to 33*sizeof(float), but it only updated the first 23 vertices. Can someone tell me what the offset and size parameters are suppose to be ?

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