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. 



1898. Beitrage zur Anatomie und Histologie der Nemertinen. Zeit. f. 

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Burger, O. 



1890. Beitrage zur Kenntnis des Nerversystems der Nemertinen. 

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1890. Untersuchungen uber die anatomie und Histologie der Nemer- 

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Text figs. 1-43. 

 Coe, W. R. 



1905. On the anatomy of a species of Nemertinean (Cerebratulus lacteus 



Ver). Trans. Conn, ac, vol. 9, pp. 480-514, pi. 10-15. 



1905. Nemerteans of the west and northwest coast of North America. 

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1880. Zur Anatomie der Nemertinen. Zool. anz. 



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De Quatrefages 



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1889. Beitrage zur Kenntnis der textur des Central Nervensvstem 

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1917. A reconstruction of the Nervous System of a Nemertinean Worm. 

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