Ziphius cavirostris.

Fig. 1. Skull. (Topotype of Ziphius grebnitzkii.) Bering Island. Male (?), adult. Cat. No. 21248, U.S.N.M. Dorsal aspect. ⅙ nat. size.

2. Skull. Newport, Rhode Island. Male, adult. Cat. No. 49599, U.S.N.M. Dorsal aspect. ⅙ nat. size.

Plate 18 SKULLS OF ZIPHIUS CAVIROSTRIS

Ziphius cavirostris.

Fig. 1. Skull. (Type of Ziphius semijunctus (Cope).) Charleston, South Carolina. Ventral aspect. ⅙ nat. size.

2. Skull. Barnegat City, New Jersey. Ventral aspect. ⅙ nat. size.

Plate 19 SKULLS OF ZIPHIUS CAVIROSTRIS