This bone is the distal end of a femur, Polycotylid
Plesiosaur, which is the short-necked Plesiosaur.
Another plesiosaur bone (neck vert), pics is under recent finds.
Turtle Bone and Vert
This one isn't another paddle bone as I thought. It turns out it is part of a giant turtle.
Vert pictured below
[not sure if correct photo but taken same day as others]