88 BULLETIN 73, UNITED STATES NATIONAL MUSEUM. 



Plate 33. 



FlQ.l. Berarditishairdii. Atlas. St. George Island, Alaska. Female, adult. Cat. No. 49726, U.S.N. M. 

 Anterior surface, i nat. size. 



2. The same specimen. Right ."acapnia, i nat. size. 



3. The same specimen. Humerus, i nat. size. 



4. Berardius bairdii. St. George Island, Alaska. Left pectoral limb. (.'at. No. 49727. Male, 



immature. \ nat. size. 



PlATE 34. 

 Tympanic bones of Mesoplodon, Ziphius, and Berardius. 



Fig. 1. Mesoplodon densirostrU (1) . Annisquam, Massachusetts. 



2. Mesoplodon slejnegeri. Yaquina Bay, Oregon. 



3. Ziphiiis cavirostris. (Type ot Z. semijimctus (Cope).) Charleston, South Carolina. 



4. Ziphius cavirostris. (Type of Z. grcbnitzkii Stejuegei.) Bering Island. 



5. Ziphius cuiirostris. Barnegat City, New Jersey. 



6. Ziphius caviroslris. Newport, Rhode Island. 



7. Berardius bairdii. Centerville, California. 

 Ventral aspect. Nat. size. 



Plate 35. 



Tympanic bones of Mesoplodon, Ziphius, and Berardius. 



Fig. 1. Mesoplodon densiroslris (t). Annisquam, Massachusetts. 



2. Mesoplodon slejnegeri. Yaquina Bay, Oregon. 



3. Ziphius cavirostris. (Type oi Z . semijunctus (Cope) .) Charleston, South Carolina. 



4. Ziphius cavirostris. (Type of Z. grehnitzkii Stejneger). Bering Island. 



5. Ziphius caviroslris. Barnegat City, New Jersey. 



6. Ziphius caviroslris. Newport, Rhode Island. 



7. Berardius bairdii. Centerville, California. 

 External surface. Nat. size. 



Plate 36. 



Right periotic bones of Mesoplodon, Ziphius, and Be'urdiiis. 



Fig. 1. Mesoplodon densiroslris (1) Annisquam, Massachusetts. 



2. Mesoplodon slejnegeri. Yaquina Bay, Oregon. 



3. Ziphius caviroslris. (Type oi Z. semijunctus (Cope).) Charleston, South Carolina. 



4. Ziphius caviroslris. (Type of Z. grebnilzUi Stejneger.) Bering Island. 



5. Ziphius caviroslris. Barnegat City, New Jersey. 



6. Ziphius cavirostris. Newport, Rhode Island. 



7. Berardius bairdii. Centerville, California. 

 Inner aspect. Nat. size. 



Plate 37. 

 Right periotic bones of Mesoplodon, Ziphius, and Berardius. 



Fig. 1. Mesoplodon derisiroslris (?) Annisquam, Massachusetts. 



2. Mesoplodon slejnegeri. Yaquina Bay, Oregon. 



3. Ziphius caviroslris. (Type of Z. semijunctus (Cope).) Charleston, South Carolina. 



4. Ziphius cavirostris. (Type of /. grebnilzUi Stejneger). Bering Island. 



5. Ziphius cavirostris. Barnegat City, New Jersey. 



6. Ziphius cavirostris. Newport, Rhode Island. 



7. Berardius bairdii. Centerville, California. 

 Outer aspect. Nat. size. 



