CERATIUM, NOCTILUCA 35 



of later stages, which appear as chains of fully formed in- 

 dividuals attached together. 



Kofoid: Exuviation, Autotomy, and Regeneration in Ceratium. Univ. 



Calif, Pub. 4, 1908. 

 : The Free Living Unarmored Dinoflagellates. Mem. Univ. Calif. 



Pub, vol. 5, 1921. 



NOCTILUCA 



If living specimens are not to be had for study, material 

 preserved in alcohol, after suitable fixation, can be used. 

 Specimens are best examined in a cell-slide under a cover- 

 glass. 



1. Observe the nearly globular shape, and on one side a 

 groove from which arises a large fiagellum or "tentacle." Is 

 there a deep groove near it? At the bottom of this groove 

 it is possible to see the mouth in a living specimen. An- 

 other smaller fiagellum is visible in living specimens inserted 

 at the bottom of the mouth, but in preserving the organism 

 it is usually destroyed. 



2. Note the appearance of the preserved protoplasm. The 

 endoylasm appears parenchymatous. At one point a more 

 compact mass is seen, from which strands appear to radiate. 

 This has been found to contain the nucleus. 



Noctiluca is luminescent, and frequently causes very 

 brilliant displays. 

 Make a drawing. 



Calkins: Nuclear Division in Noctiluca. Jour. Morph, 15, 1899. 

 Kofoid: Craspedotella. Bull. Mus, Harvard, 46, 1905. 



