178
HENRIETTE HERLANT-MEEWIS
RC
RSO
21 d
Fio. 17. Eisenia foetida unicolor. Normal cephalic regeneration in presence of the nerve
cord following removal of the first seven segments after 4, 6, 11 and 21 days. B, Blastema;
BC, buccal cavity; Oe, oesophagus; ONC, old nerve cord; RC, regenerated cerebral
ganglion; RNC, regenerated nerve cord; RP, regenerated pharynx; RSO, regenerated
suboesophageal ganglion ; St, stomodaeum. (Avel, 1961.)