Wikipedia to the Rescue

I just pulled up the Wikipedia article on Lobsters. It's quite long. Let's see what it says on Lobster anatomy.

Like all arthropods, lobsters are largely bilaterally symmetrical; clawed lobsters often possess unequal, specialized claws, like the king crab. The anatomy of the lobster includes the cephalothorax which is the head fused with the thorax, both of which are covered by the carapace, and the abdomen. The lobster's head consists of antennae, antennules, mandibles, the first and second maxillae, and the first, second, and third maxillipeds. Because a lobster lives in a murky environment at the bottom of the ocean, its vision is poor and it mostly uses its antennae as sensors. The abdomen of the lobster includes swimmerets and its tail is composed of uropods and the telson.

That doesn't seem like that will help me check his pulse.

Oh by the way, those of you who were upset about Space Lobster eating at a Sushi place, check out this note on the diet of a lobster.

Although many studies suggested that lobsters are primarily scavengers, feeding on molluscs and decaying animal matter, recent studies have shown that they primarily feed on live fish, dig for clams, sea urchins, and feed on algae and eel-grass. They occasionally eat other lobsters, too.

Anyway anybody out there who knows about lobster circulation please drop a note in the comments section.