Figure 59. —The narrow lower jaw of a sperm whale contains from 18 

 to 25 large functional teeth, which fit neatly into sockets in the upper 

 jaw. Occasionally, the upper jaw also contains some teeth. {Photo 

 from the North Pacific by Japanese Whales Research Institute, 

 courtesy of H. Omura. ) 



Figure 60. — The throat and lower jaw of a sperm whale on the deck of an 

 eastern Canadian whaling station, showing the numerous short throat 

 grooves, which are most clearly evident on adult animals. (Photo by J. 

 G. Mead.) 



Figure 61 . — Detail of the broad, paddle-shaped flipper of a sperm whale 

 from the North Pacific. {Photo from Japanese Whales Research In- 

 stitute, courtesy of H. Omura. ) |J| 



62 



