Plate III. 

 Fig. 15. Transverse section through adult Cha'toptcrus variopcdatits. 

 Taken through middle of anterior region. X '•'• 



Fig. 16. Transverse section through posterior portion of anterior region. 

 X 7. 



Fig. 17. Transverse section directly back of anterior region. Taken through 

 narrow portion of 12th segment. X '^^ 



Fig. 18. Transverse section through same region. Taken nearer parapodia 

 of 12th segment than that shown in Fig. 17. x '*'• 



Fig. 19. Transverse section through parapodia of sexual segment, x '''• 



