PLATE 31. 



Figs. 1-4, 7 

 (lorma jniionica. 



S, 10. Cross .sections of Chartoilerma californica. 

 X 33. Fig. i). Pmnroniriiia hawaiien.sis. 



(X 33.) Figs. 5, 0. Chaeto 



Fig. 

 Fig. 

 Fig. 

 - Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 glion ri'll; 

 Fig. 



Through radula. 



Through junction of pharynx and stomacli 



Through heart and coelomoduets. 



Througli brain region. 



Through brain of Chart odcrnia japonica. 



Through I'adula, same species. 



Tlu'ough outlet of coelomochict, on left. 



Pharynx and glands in front of radula. 



External sen.-iory atrial ridge of Pron<-omenia liawaiiensis; os, ridge resting upon gan- 

 >; oin, outer atrial ridge; e, cirrus. 

 10. Through suprarectal commissure 



