572 STUDIES ON EAETPI WORMS. 



Fig. 17. — A small portion of a section through the epidermis, to show a 

 capillary loop, d, passing between the columnar cells, b, and the small 

 cells, c. a. The cuticle, e. The circular muscles. 



EiG. 18. — A portion of the epidermis from somite xviii, in order to show 

 its clitellar structure. «. Cuticle. ^. Columnar epithelial cells, e. Elongated 

 club-shaped clitellar cells, d. Circular muscles. 



Fig. 19. — An ovary. 



