PLATE 12. 



Panthalis panamensis Chamberlin. 



Figures 1-6. 



l._ Median seta, distal end, first setigerous parapodium. X 530. 



2, — Ventral seta, distal end. X 500. 



3. — Small of median series. X 326. 



4 — Ordinary type of seta of median series (filament missing). X 31. 



5. — Elytron from near thirtieth somite. X 31. 



6. — First right eh'tron. 



Euphrosyne panamica Chamberlin. 



Figures 7, 8. 



7. — Dorsal seta, second type. X 326. 



8. — Tip of larger form of ventral seta. X 326. 



