PLATE 23. 



Corynocephalus paumotanus Chamberlin. 



Figures 1-3. 



1. — Anterior end, dorsal view. X 27. 



2. — Anterior end, ventral view. X 27. 



3. — Parapodium of twentieth somite, anterior view. X 27. 



Plotohelmis alata Chamberlin. 



Figures 4-10. 



4. — Prostomium, dorsal view. X 27. 

 •5. — Anterior end, ventral view. X 27. 

 6. — Parapodium from middle region of body. X 63. 

 7. — Notocirrus of third (or foiu-th) parapodium. X 63. 

 8. — NotociiTUS of fourth (or fifth) parapodium. X 63. 

 9. — Notocirrus of sixth parapodium. X 63. 

 10. — Notocirrus of twelfth parapodium. X 63. 



