430 BICKFORD. 
EXPLANATION OF FIGURES. 
(These sketches were made from living forms, studied under a low magnifying 
power.) 
Fics. 1, 2, 3. Regenerative process. Fig. 1, healing of the cut end in the first 
stage, z.c. when first cut. The thin ring of coenosarc, with its central septum, is 
surrounded by the perisarc; Fig. 2, same a few minutes later ; the ends of the cells 
have begun to elongate towards the center; Fig. 3, the same later; the cells have 
met in the center, completely closing the wound. (These three figures are 
diagrammatic.) 
Fics. 4, 4a, 5. Hydranth formation. Fig. 4, stem as it appeared two hours 
after healing, showing enlarged somatic cavity at one end; Fig. 4a, same several 
hours later, showing the thickened pigmented spots at the upper end, and bands 
of deeply pigmented cells below; Fig. 5, same later, with hydranth just emerging 
from the perisarc. 
Fics. 6, 7, 8, 9,10, 11. Stem which was deeply pigmented in two places. Cuts 
were made at x and y, and the contents of each section pressed out; Fig. 7, con- 
tents of upper portion when first pressed out; Fig. 8, same shortly after; Fig. 9, 
same the next morning; Fig. 10, contents of lower section when first pressed out ; 
Fig. 11, same the next morning. 
Fic. 12. Portion of stem 3 mm. long. a, Old hydranth not completely sev- 
ered from the perisarc; 4, new hydranth seen the next day; ¢, third hydranth 
found the following day. 
Fics. 13, 14, 18, 19. Parts of a stem cut in twenty parts. Fig. 13, form as 
seen in the perisarc; Fig. 14, same pressed out; Fig. 18, form seen in the 
perisarc ; Fig. 19, same when pressed out. 
FIGs. 15, 16, 17, 20, 21, 22. Forms regenerated from portions of a stem cut 
into fifty parts. Figs. 15, 17, 20, 22, are forms within the perisarc; Figs. 16 and 
21, forms are same as 15 and 20, only pressed out of the perisarc. 
Fics. 23, 24. Regeneration of split stems. Fig. 23, small fragment of split 
perisarc, upon which are two small portions of the coenosarc; these have healed 
and showed rapid circulation in even the narrowest part; Fig. 24, split stem with 
five complete hydranths; four of these from fragments of coenosarc, and one from 
the main stem. One small portion of the coenosarc has not fully regenerated. 
