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sense, as observed in Chrysemys. While we have not been able as 

 yet to determine this point, the later shifting of the sex-cells from the 

 median anläge at the root of the mesentery, to the sex-gland anlagen, 



Fig. 5. Detail of a ti'ansverse section through the sex-cell region of a larva of 

 E,. pipieus 8.3 mm in length. M. Mesentery. 



would seem to be a clear case of active migration; hence it seems 

 fairly well established that the sex-cells possess, to some extent at 

 least, the power of migration. 



