XIII 



PHYLUM CHORD ATA 



529 



and fifth metacarpals are represented only by rudiments. TIic 

 proximal phalanges of the three digits are early aukylosed with 





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OB 



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o 



4* 

 I 

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the corresponding metacarpals, so that it might readily be supposed 

 that one of the ordinary bones of each digit was absent. 



