EXPLANATION OF PLATE XXXI. 
Protostega gigas. (Carnegie Museum. Cat. Vert. Fossils, No. 1420.) 
(a) Right and left shoulder girdles, with right front flipper and the proximal half-of the left 
humerus. : 
(6) Pelvic girdle with both hind flippers. 
(h) The accompanying hyoids. 
The elements are shown as photographed in superior view in approximately the position in 
which they were imbedded and crushed out flat in the matrix of chalk. All the elements belong 
to a single individual from the Niobrara Cretaceous of western Kansas. 
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