362 GC) Me Child 
As compared with the preceding cases the most conspicuous 
feature here is the grouping of the tentacles in circles or partial 
circles instead of in rows along the two sides of the line of union. 
This arrangement of the tentacles suggests that there is some ap- 
proach to the formation of new discs at several points about the 
margin of the ring. If this is the case a new polarity must be 
established at each of these points. 
This piece never produced any more tentacles; about three weeks 
after section decrease in the distension became marked and finally 
the body-wall became so contracted or reduced that the mesenterial 
organs burst through the region of union at various points and 
death soon followed. 
b 
IO 
I5 
Fics. 15-16 
IV Figs. 15 and 16. This piece was taken from the region 
just proximal to the cesophagus. Considerable extrusion of 
mesenterial organs occurred and the extruded parts were cut off, 
but some portions remained and were included when the piece 
closed. Fig. 15 shows the piece eleven days after section: four 
groups of tentacles have appeared, one of them consisting of four 
tentacles of equal length, forming a complete circle, the other three 
groups of three tentacles each, forming a partial circle. In the 
figure the line of union is at the equator and the two lateral ten- 
tacles of each group apparently arise from it; in the groups 4, 
