4. Sibbaldius sulphureus.
Sibbaldius sulphureus, Cope, Proc. Acad. Nat. Sci. Philad. 1869, pp. 10, 19, f. 11.
Sulphur-bottom of the Whalers on the North-west Coast.
Dorsal fin very far back.
Inhab. North Pacific, north-west coast of America, California.
5. Sibbaldius tectirostris.
Sibbaldius tectirostris, Cope, Proc. Acad. Nat. Sci. Philad. 1869, p. 7.
Inhab. North Pacific. Skeleton, Mus. Philad.