The Osteology of the Scombridse. 99 



zygopophysis begins to enlarge the postero slightly enlarges to meet 

 it, but it at once begins to grow smaller again and does not help to 

 form the pedicle. The superior postero-zygopophyses are moderately 

 developed, but the antero-zygopophyses are very large and reach far 

 over them. 



The ribs, epipleurals, and other elements of the trunk are as 

 described for Euthynnus. 



