PLATE 23. 



Corynocephalus paumotanus Chambbblin. 



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 4r-10. 



4. — Prostomium, dorsal view. X 27. 

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

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

 7. — Notocimis of third (or fourth) parapodium. X 63. 

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

 9. — Notocirrus of sLxth parapodium. X 63. 

 10. — Notocirrus of twelfth parapodimn. X 63. 



