2. Skull. Newport, Rhode Island. Ventral aspect. ⅙ nat. size.

[Illustration: Plate 20 SKULLS OF ZIPHIUS CAVIROSTRIS]

_Ziphius cavirostris._

Fig. 1. Skull. (Type of _Ziphius semijunctus_ (Cope).) Charleston, South

Carolina. Cat. No. 21975, U.S.N.M. Lateral aspect. ⅙ nat. size.