PLATE 40 

 Fig. 15-20, MoJgula verrucifera. 



Fig. 15. Animal viewed from left side, test removed. X4i/4. 



Fig. 16. Portion of branchial sac showing three folds. 



Fig. 17. Tip of atrial siphon showing processes. 



Pig. 18. Tip of branchial siphon showing processes. 



Fig. 19. Branchial tentacles. 



Fig. 20. Hypophysis and ganglion. 



Fig. 21 Diplosoma caulleryi. Zooid viewed from right side. 



Fig. 22. BotryXlus tuberatus. Zooid enlarged, view from left side especi- 

 ally to show the snout-like atrial siphon, a.s. 



Fig. 23. Didemnum carnulentum, var. lacteolum. Zooid much enlarged, viewed 

 from left side. 



