Hunt. — Regenerative Phenomena in Earthworms. 



EXPLANATION OF THE PLATE. 



ABBRE\^ATIONS. 



d>. — brain. 



e'drm. — ^ epidermis. 



ivg. d. — dorsal invagination. 



Jem. hyl. — h3'aline sheath. 



mu. crc. — regenerated circular muscles. 



mu. Ig. — regenerated longitudinal muscles. 



n. V. — ventral nerve cord. 



stmd. — stomodeiun. 



irt. 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 showoi between A and B. 



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

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

 and nerve cord are shown. Note that the hyaline sheath (lent, 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 -ndth 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 drawai with a dotted line. 



