Fig. 22. — Luminous gland oi Cypridina hilg eyid or fii {after Yatsu). 2, longitudinal section. 



4, transverse section. 



Fig. 23. — Single enlarged gland cell of Cypridina {after Dahlyren). P, nucleus and 

 plasmasome; C, cytoplasm; F, secretion fibrils; D, reservoir duct filled with large yellow 

 granules; O, valve-like outer opening of cell at surface of body. 



