PLATE 26. 



Figs. 1-7. Chaotodcrma argrnlea. X 33; Fig. 8. Strophomcnia rcgularis. Fig. 9. Alcxan- 

 dromenia agassizi. 



Through brain region. 



Through radula. 



Tlirough heart and eoelomoducts. 



Through suprareclal commissure. 



Through region of outlet of coelomoduets. 



Through jjosterior end of prothorax. 



Through junction of pharj-nx and stomach. 



Reconstruction of posterior end of Strophomenia regularis. 



A portion of the ventral salivary glands and duct in Alexandromenia agassizi. 



