FRESH WATER ANIMALS: DEPOSITS: AMPHIBIA 



lopment, this may indicate selective utilization, but the general signi- 

 ficance of the variations is not yet apparent. 



An important point emphasized by Morton and Rosen is that one 

 must recognize a distinction between carotenoids carried with fat in 

 lipid transfer and those mobilized in accordance with a cycle of specific 

 utilization. The practical recognition of these two phases of carotenoid 

 metabolism is not always a simple matter. 



It is claimed by Rokhlina^ ' that carotene antagonizes the thyrogenic 

 stimulation of axolotl metamorphosis. 



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213 



