NEMERTINEA 53 



In the blastula of Cerebratulus cells on the apex of the larvae 

 develop cilia and sink below the general surface. This forms the 

 apical sense organ of the larva. 



The brain of the adult develops by thickenings of the apical 

 discs. 



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Bohming L. ^^^. Anatomie und Histologie der Nemertinen. Zeit. f. 



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