Plate 15 SKULLS OF ZIPHIUS CAVIROSTRIS
Ziphius cavirostris.
Fig. 1. Skull. Bering Island. (Topotype of Ziphius grebnitzkii.) Female (?), adult, Cat. No. 22069, U.S.N.M. Dorsal aspect. ⅙ nat. size.
2. Skull. Bering Island. (Topotype of Ziphius grebnitzkii.) Dorsal aspect. Cat. No. 21246. ⅙ nat. size.