166 



THE FROG. 



on these arches. From the gills the blood, now aerated, passes 

 into the efferent branchial vessels (Fig. 76, EF). These lie 



a : 



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 <r _ . fi-g^;:-c cs = 





-ililllfe! 



< ^ .w ^ _ 



^ . bo I .S|rf58 



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S-r. SlW-sr-S 



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alongside the afferent branchial vessels, and just in front of them, 

 but do not communicate with them except through the capillary 

 loops of the gills. 



