242 EUMETOPIAS STELLERI STELLER's SEA LION. 



the hyoid bone is reduced almost to a bony filament. The length 

 of the hyoid bone in the present species is 270 mm. ; of the trans- 

 verse segment, 65 mm. ; circumference of the transverse segment, 

 45 mm.; of this segment at the thickest part, 95 mm. 



The os penis is 170 mm. long, slightly arched, somewhat flat- 

 tened above, especially posteriorly, sharply convex below, and 

 abruptly expanded and squarely truncate at the end. Its cir- 

 cumference at the base is 72 mm.; just behind the terminal ex- 

 pansion, 32 mm. ; of the terminal expansion itself, 65 mm . 



Measurements of the Skeleton. 



