496 



INVERTEBRATA 



CHAP. 



stomodaeum, as homologous with the adult mouth of an Ophiuroid, 

 then we might say that in the Ophiuroid this point is displaced ly 



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si 



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lift 



growth towards the left side, whereas in the Asteroid it disappears and 

 is replaced tya new growth farther to the left. Therefore the Asteroid in 

 this respect obviously exhibits a more modified course of events, and 



