BEAKED WHALES, FAMILY ZIPHIID^— TRUE. 87 



Plate 2(i. 

 Berardius bairdii. 



Fro. 1. Type-akull. Bering Island. Immature, (at. No. 20992, U.S.N. M. Dorsal aspect. About 

 jJj nat. size. 

 Frontals and zygomatic processes somewhat defective. 



2. Skull. St. George Island, Pribilof Group, Alaska. Female, adult. Cat. No. 49726, U.S.N. M. 



Dorsal aspect. About -^ nat. size. 



3. Skull. Centerville, California. Male (?), adult. Cat. No. 4972.5, U.S.N.M. Dorsal aspect. 

 All figs, about -^ nat. size. 



Pl.\te 27. 



Berardius bairdii. 



Fig. 1. Type-skull. Bering Island. Immature. Cat. No. 20992, U.S.N.M. Ventral aspect. 



2. St. George Island, Alaska. Female, adult. Cat. No. 49726, U.S.N.M. Ventral a.spect. 



3. Centerville, California. Male (?), adult. Cat. No. 49725, U.S.N.M. Ventral aspect. 

 All figs, about Yn "*t- size. 



Plate 28. 



Berardius bairdii. 



Fig. 1. Skull. St. George Island, Alaska. Female, adult. Cat. No. 49726, U.S.N.M. Lateral aspect. 



2. Skull. Centerville, California. Male (?), adult. Cat. No. 49725, U.S.N.M. Lateral aspect. 



3. The same skull. Posterior aspect. 



4. Type-skull. Bering Island. Cat. No. 20992, U.S.N.M. Posterior aspect. 

 All figs, about Yo °^'- si^6. 



Pl.\te 29. 



Berardius bairdii. 



Figs. 1^. Bering Island. Young. Cat. No. 142118 U.S.N.M. 



5. Skull. St. George Island, Alaska. Male, immature. Cat. No. 29727, U.S.N.M.' Posterior 

 aspect. iTj nat. size. 



Pl.\te 30. 



Mandibles of Berardius bairdii. 



Fig. 1. Bering Island. Young. Cat. No. 142118, U.S.N.M. 



2. St. George Island, Alaska. Male, immature. Cat. No. 49727, U.S.N.M. 



3. Bering Island. Adult. (From mounted skull.) 

 Dorsal aspect, -fn nat. size. 



Plate 31. ^ 



Mandibles of Berardius bairdii. 



Fig. 1. Bering Island. Young. Cat. No. 142118, U.S.N.M. 



2. St. George Island, Alaska. Male, immature. Cat. No. 49727, U.S.N.M. 



3. Bering Island. (From type-skull.) Immature. Cat. No. 20992, U.S.N.M. 



4. Centerville, California. Male (?), adult. Cat. No. 49725, U.S.N.M. 



5. Bering Island. Adult. (From mounted skull.) 



Lateral aspect. A nat. size. 



Pl.^te 32. 



Berardius bairdii. 



Fig. 1 Vertebra. St. George Island, Alaska. Female, adult. Cat. No. 49726, U.S.N.M. The 

 vertebrae from left to right are as follows: 1-3 cervicals, 1st thoracic, 8th thoracic, 9th thoracic, 

 10th thoracic, 1st lumbar, 1st caudal. 



2. The .same specimen. Sternum. Ventral aspect. About 1 nat. size. 



3. Hyperoodon ampullalus. Newport, Rhode Island. Acad. Nat. Sci. Philadelphia. 



