PLATE 26. 



Figs. 1-7. Chactodcrma argentea. 

 ilrniniMiia agas.sizi. 



X 33; Fig. S. Strophcmrnia rcgulari.s. Fig. 9. .\lexan- 



Fig 

 Fig 

 Fig 

 Fig 

 Fig, 

 Fig, 

 Fig, 

 Fig, 

 Fig 



4. 

 5. 

 G. 

 7. 



S. 

 9. 



riirciugh brain region. 



riiriiugh radula. 



riiniugli heart and eoeloinoduots. 



riirougli suiirarcrtal commissure. 



rhrougli region of outlet of coelomoducts. 



Plirougli ])osterior end of jirolhorax. 



riuougli junction of ]iliar)'nx and stomach. 



Reconstruction of pcstcrior end of Strophomenia rcgularis. 



A portion of the ventral salivary gland.? and duct in AlexandroiiK nia aga.ssizi. 



