I believe that's a form of a "igloo" ink bottle. Look really carefully along the base with a magnifying glass, as there may be very small marking. Excellent find!
Dang Mine has no embossing...... But it looks exactly like one on E-Bay [FONT="]Morgans Patent July 16, 1867 Glass Igloo Ink Bottle. I was thinking ink bottle but didn't know what breed it was! Thanks guys great ID![/FONT]