114 INVERTEBRATE PHYSIOLOGY 



In cicadas the flight muscles have possibly evolved through a myogenic 

 stage back to a 1 :1 system. 



(4) Two tentative hypotheses are put forward to explain the phe- 

 nomenon of deactivation by release. One depends on a longer diffusion 

 pathway between sarcosomes and the interior of the sarcostyles in fibrillar 

 muscle; the other is based on Weber's hypothesis that the splitting of 

 bound ATP provides the immediate energy source for the contraction of 

 the actomyosin complex in the myofibril, and postulates a lag between ATP 

 binding and ATP splitting to account for the deactivation interval. 



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