88 BULLETIN 73, UNITED STATES NATIONAL MUSEUM. 



Plate 33. 



Fig. I. Berardiusbairdii. Atlas. St. George Island, Alaska. Female, adult. Cat. No. 49720 , U.S.N. M. 

 Anterior surface. I nat. size. 



2. The .same specimen. Right scapula. } nat. size. 



3. The same specimen. Ilumerus. 1 nat. size. 



4. Bcrardius bairdii. St. George Lsland, Alaska. Left pectoral liml). Cat. No. 49727. Male, 



immature. I nat. size. 



Plate 34. 

 Tympanic bones of Mesoplodon, Ziphiiis, and Btrardius. 

 Fig. 1. Mesoplodon densiroslris C?). Annisquam, Massachusetts. 



a. 



Mesoplodon stejnegcri. Yaquina Bay, Oregon 



3. Ziphius cavirostris. {Type oi Z. semi junctus (Cope).) Charleston, South Carolin 



4. Ziphius cavirostris. {Type oi Z. grebnHzkii^te\ne^er.) Bering Island. 



5. Ziphius cavirostris. Barnegat City, New Jersey. 



6. Ziphius cavirostris. 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 {"!). Annisquam, Massachusetts. 



2. Mesoplodon stejnegeri. Yaquina Bay, Oregon. 



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



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



5. Ziphius cavirostris. Barnegat City, New Jersey. 



6. Ziphius cavirostris. Newport, Rhode Island. 



7. Berardius bairdii. Centerville, California. 

 External surface. Nat. size. 



Plate 36. 



Right periotic bones of Mesoplodon, Ziphius, and Beunlius. 



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



2. Mesoplodon stejnegeri. Yaquina Bay, Oregon. 



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



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



5. Ziphius cavirostris. Barnegat City, New Jersey. 



6. Ziphius cavirostris. Newport, Rhode Lsland. 



7. Berardius bairdii. Centerville, California. 

 Inner aspect. Nat. size. 



Plate 37. 

 Right periotic bones of Mesoplodon, Ziphius, and Berardius. 



Fig. I. Mesoplodon densiroslris ("!) Annisquam, Massachusetts. 



2. Mesoplodon stejnegeri. Yaquina Bay, Oregon. 



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



4. Ziphius cavirostris. (Type oi Z. grcbnitzHi Ste']neger). Bering Island. 



5. Ziphius cavirostris. Barnegat City, New Jersey. 



6. Ziphius cavirostris. Newport, Rhode Island. 



7. Berardius bairdii. Centerville, California. 

 Outer aspect. Nat. size. 



