PLATE 29. 



Figs. 1-5, 8, 12. Cross sections of Chaetoderma erudita. X 33. Figs. 6, 7, 9-11. Chaetoderma 

 scabra. X 20. 



Fig. 1. Through heart and coelomoducts. 



Fig. 2. Close to junction of pharynx and stomach 



Fig. 3. Posterior end of prothorax. 



Fig. 4. Through brain. 



Fig. 5. Through outlet, on right, of coelomoduct. 



Fig. 6. Suprarectal commissure. 



Fig. 7. Through gills and cloacal cliamber. 



Fig. 8. Through radula. 



Fig. 9. Through junction of pharynx and stomach. 



Fig. 10. Through heart and coelomoducts. 



Fig. 11. Through posterior end of prothorax. 



Fig. 12, Through suprarectal commissure. 



