I have an enormous backlog...
> Because sauropods were so pneumatic they would have chronically > floated, not sunk to the bottom like nonpneumatic, heavy boned > aquatic animals. Perhaps, if Henderson is correct, and did not underestimate the density of the lower limbs.
How would it even be possible to underestimate the density of the lower limbs? ~:-| They're massive. It's just bone, muscle, skin, cartilage, ligaments, tendons, and blood. The lower limbs are pneumatized in some birds and some pterosaurs, but not in any known sauropod, if that's what you mean.