Hunt. — Regenerative Phenomena in Earthworms. 



EXPLANATION OF THE PLATE. 



Abbreviations. 



cb. — brain. 



e'drm. — epidermis. 



ivg. d. — dorsal invagination. 



lem. hyl. — • hyaline sheath. 



mu. crc. — regenerated circular muscles. 



mu. Ig. — regenerated longitudinal muscles. 



n. V. — ventral nerve cord. 



stmd. — stomodeum. 



trt. in. — digestive tube. 



Figure 1. Worm 66. Helodrilus caliginosus. Camera lucida sketch, 

 X 12. The regenerated tissue lacks longitudinal and circular muscle fibers. 



Figure 2. Worm 67. Helodrilus caliginosus. Camera lucida sketch, 

 X 13.5. Brain, muscle fibers, and stomodeum have regenerated. The 

 regenerated tissue extends from a to c. 



Figure 3. Worm 291. Eisenia foetida. Free-hand sketch of the anaes- 

 thetized worm made just before killing. The regenerated, segmented section 

 of the body is shown between A and B. 



Figure 4. Worm 272. Eisenia foetida. Camera lucida sketch, X 16.5. 

 The regenerated tissue lacks muscle fibers. Regenerated brain, stomodeum, 

 and nerve cord are shown. Note that the hyaline sheath {Jem. hyl.) terminates 

 some distance from the end of the nerve cord. 



Figure 5. Worm 433. Eisenia foetida. Camera lucida sketch, X 15. 

 The anterior region of both nerve cord and digestive tube were excised. Note 

 the dorsal invagination {ivg. d.) and its intimate relation with the regenerating 

 nerve cord and digestive tube. Branches a and c of the ventral nerve cord 

 were not found in the same sections; therefore c is drawn with a dotted line. 



