SKELETON. 



241 



The bones of the hinder limbs are also short and thick, es})e- 

 cially the ffemur, which is scarcely more than one-third as long 

 as the tibia. The latter in length about equals the foot. The 

 relative length of the digits is as follows, the longest being 

 mentioned first: 5th, 1st, 2d, 3d, and 4th. The thiixl and 

 fourth are of equal length, and but little shorter than the sec- 

 ond. In respect to size, the metatarsal and phalangeal bones 

 of the fifth digit are nearly twice as large as those of the first, 

 while those of the first are about twice the size of those of 

 either of the other three. As previously noticed, the three 

 middle digits of the foot are supplied with long narrow nails j 

 the first and fifth with rudimentary ones. 



Measurements of the Bones of the Hand (Metacarpal and Phalangeal). 



Length of metacarpal and pha- 

 langes 



Length of metacarpal bone 



Length of 1st phalanx 



Length of 2d phalanx 



Length of 3d phalanx 



Middle-aged specimen. 



'B 



352 



152 



140 



60 



he 



60 



310 

 110 



80 

 25 



240 

 85 



95 70 



60 

 25 



fcj) 

 'B 



200 

 80 

 55 

 45 

 20 





177 

 80 

 65 

 20 

 12 



Very old specimen. 



to 

 'B 



357 



160 



140 



57 



I 





320 



110 



95 



80 



35 



'B 



'B 



250 

 90 

 70 

 65 

 25 



205 

 80 

 60 

 45 

 20 



to 

 'B 



185 

 85 

 65 

 18 

 17 



Measurements of the Bones of the Foot (Metatarsal and Phalangeal). 



Length of metatarsal and phalan- 

 ges 



Length of metatarsal hone 



Length of 1st phalanx 



Length of 2d phalanx 



Length of 3d phalanx 



Length of naU 



Middle-aged specimen. 



WD 



310 



120 



140 



50 



tt, 

 'B 



290 

 95 

 90 

 75 

 30 

 40 



'B 



CO 



290 

 95 

 90 

 75 

 30 

 40 



Ml 



'B 



-a 

 +^ 



305 

 110 

 90 

 80 

 25 

 37 



in 



328 



130 



93 



70 



35 



Very old specimen. 



320 



145 



130 



45 



to 



B 



317 



110 



100 



80 



27 



50 



'B 



327 



110 



105 



85 



27 



55 



'B 



350 



120 



105 



95 



30 



50 



60 

 ITS 



350 



130 



110 



75 



35 



The hyoid bone is greatly developed. Each ramus consists 

 of five segments, its two rami being connected together by a 

 transverse segment articulating with the juncture of the fourth, 

 and fifth segments. All the parts of the hyoid bone are very 

 thick, especially the transverse and anterior segments; rela- 

 tively much more so than in Gallorhinus. In the common Phoca, 

 Misc. Pub. No. 12 16 



