Plate 5. 

 BoUnopsis vitrea. 



Fig. 16. Larva of BoUnopsis vitrea, 7 mm. long, in the Cydippidas- 

 stage. Tortugas, Florida, May 17, 1899. 



Fig. 17. Surface view of apical pole of larva represented in figure 16. 

 ad, adradial canals; c, subtentacular meridional canals; 

 cpr, perradial canals; i, interradial canals; p, pole-plate; 

 tv, tentacular canals; v, subventral meridional canals. 



Fig. 18. Surface view of mouth of larva shown in figure 16. Letter- 

 ing as in figure 17. gc, paragastric canals; st, mouth open- 

 ing and stomodceum. 



Pig. 19. Young BoUnopsis vitrea, 8 mm. long with oral lobes and 

 auricles beginning to develop. Tortugas, Florida, May 

 21, 1899. 



Drawn from life, by the author. 



