242 EUMETOPIAS STELLERI STELLER's SEA LION, 



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

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

 verse segment, 65 mm. ; circimiference 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" 

 Measurements of the Skeleton. 



Whole length of skeleton (including sknll) . 



Length of sknll 



Length of cervical vertebrae 



Length of dorsal vertebrae 



Length of lumbar vertebrae 



Length of caudal vertebrae 



Length of first rib 



Length of first rib, osseous portion 



Length of first rib, cartilaginous portion 



Length of second rib 



Length of second rib, osseous portion 



Length of second rib, cartilaginous portion . 



Length of third rib 



Length of third rib, osseous portion 



Length of third rib, cartilaginous portion . . . 



Length of fourth rib 



Length of fourth rib, osseous portion 



Length of fourth rib, cartilaginous portion. . 



Length of fifth tib 



Length of fifth rib, osseous portion 



Length of fifth rib, cartilaginous portion 



Length of sixth rib 



Length of sixth rib, osseous portion 



Length of sixth rib, cartilaginous portion 



Length of seventh rib 



Length of seventh rib, osseous portion 



Length of seventh rib, cartilaginous portion. 



Length of eighth rib 



Length of eighth rib, osseous portion 



Length of eighth rib, cartilaginous portion. . 



Length of ninth rib , 



Length of ninth rib, osseous portion 



Length of ninth rib, cartilaginous portion 



Length of tenth rib , 



Length of tenth rib, osseous portion 



Length of tenth rib, cartilaginous portion. . . 

 Length of eleventh rib, osseous portion only 



