86 BULLETIN 73, UNIXED aTAIES NATIONAL MUSEUM. 



Plate 20. 



Ziphius cavirostris. 



Fig. L Skull. (Type of Ziphius semijunctus (Cope).) Charleston, South Carolina. Cat. No. 21975, 

 U.S.N.M. Lateral aspect. ^ nat. size. 



2. Skull. Barnegat City, New Jersey. Lateral aspect. ,\ nat. size. 



3. Skull. (Type of Ziphius grebnitztii Stejneger.) Bering Island. Cat, No. 20993, U.S.N.M. 



Lateral aspect. I 'Mt. size. 



Plate 21. 

 Ziphius cavirostris. 



Fig. 1. Skull. Newport, Rhode Island. Lateral aspect. 1 nat. size. 



2. Skull. (Type of Ziphius semijinu'lus (Cope).) Charleston, South Carolina. Posterior aspect. 



} nat. size. 



3. Skull. Barnegat City, New Jersey. Posterior aspect. ^ nat. size. 



4. Skull. (Topotype of Ziphius grehnitzUi Stejneger.) Posterior aspect, i nat. size. 



5. Skull. Newport, Rhode Island. Posterior aspect. \ nat. size. 



Plate 22. 

 Mandibles of Ziphius cavirostris. 



Fig. 1. Charleston, South Carolina. (Type of Z. semijunctus (Cope).) 



2. Newport, Rhode Island. 



3. Bering Island. Cat. No. 22069, U.S.N.M. 



4. Bering Island. Cat. No. 21248, U.S.N.M. 

 All figures about I nat. size. 



Plate 23. 



Mandibles of Ziphius cavirostris. 



Fig. 1. Bering Island. (Type of Ziphius grehnitzUi Stejneger.) Cat. No. 20993, U.S.N.M. About J 

 nat. size. 



2. Newport, Rhode Island. Symphysis. Dorsal aspect. 



3. The same. Ventral aspect. 



Plate 24. 



Mandibles and vertebrte of Ziphius cavirostris. 



Fig. 1. (Type of Z. semijunctus (Cope).) Charleston, South Carolina. Cat. No. 21975, U.S.N.M. 

 I nat. size. 



2. (TypeotZ.grebnitzkiiSteineger.) Bering Island. Cat. No. 20993, U.S.N.M. About J nat. size. 



3. Barnegat, New Jersey. About ^ nat. size. 



4. Vertebra". (Type of Z. semijunctus (Cope).) From right to left, as follows: 1-3 cervicals, 1st 



thoracic, 7th thoracic, 8th thoracic, 1st lumbar, 1st caudal. About J nat. size. 



Plate 25. 

 Ziphius cavirostris (Type of Z. semijunctus (Cope).) 



Fig. 1. Atlas. Anterior surface. Defective on left side. 



2. Sternum. Ventral aspect. 



3. Right pectoral limb. Scapula somewhat defective. 

 About J nat. size. 



