PLATE 28. 



Figs. H5, 8, 9. Cross sections of Chaetoderiiia hawaiiensis. X 55; P'igs. 7, 10-12. Ch.ie:oilerma 



nanula. X 33. 



P'ig. ] . Through brain and I)ucoal plate. 



Fig. 2. Through raduhi. 



Fig. 3. Tlirough junction of pharynx and stomach. 



Fig. 4. Through sui^rarectal commissure. 



Fig. 5. Through heart antl coelonioducts. 



Fig. (). Tlirough outlet of coolomockict, on left, and origin of pericardial opening. 



Fig. 7. Through brain region. 



Fig. 8. Through posterior end of prothorax. 



Fig. 9. Longitudinal section of posterior end. 



Fig. 10. Section through outlet of coelomoduct, on left. 



Fig. 11. Through radula. 



Fig. 12. Through suprarectal commissure. 



