Squid
Circulatory System

The squid has a relatively complex circulatory system for invertebrates, with a closed circulatory system. The squid has two branchial hearts at the base of the gills which send unoxygenated blood through the gills. The third ventricular heart then pumps this oxygenated blood throughout the body.

http://encarta.msn.com/media_461553803/Generalized_Anatomy_of_a_Squid.html