360 | C. M. Child 
II Fig. 10. This piece, like No. 1, is from the region just 
proximal to the cesophagus. Some portions of the mesenterial 
organs protruded after section and were removed, but a large part 
still remains. Fig. 10 shows the piece twenty-five days after sec- 
tion, when the tips of the longer tentacles were just beginning to 
show atrophy in consequence of the decrease in distension. Only 
the two groups of tentacles shown in the figure appeared on the 
piece. Each of the two groups has an equal number of oral and 
aboral tentacles—five in the one, two 1n the other—and each has an 
oral-aboral tentacle at each end. In the group at the right the 
oral-aboral tentacles are forked, i. e., they began their develop- 
ment as separate oral and aboral tentacles and then fused; in the 
other group the two tentacles at the ends are simple, and while 
their position and relation to the other tentacles and the line of 
union seem to indicate that they are oral-aboral in character, 
yet they appear to belong more to the oral (in the figure, the upper) 
side of the line of union than to the aboral, and in the history of 
the piece their time of appearance and stage development is of 
much more like the oral than the aboral tentacles. 
In this case, as in the preceding, aboral tentacles appear later 
than oral except in the composite tentacles, and aboral tentacles 
are always opposite oral tentacles. 
III Figs. 11 to 14. As nearly as could be determined, the 
piece represents approximately the region between the lines d 
and ¢ in Fig. 1. After section a large part of the mesenterial 
organs protruded from the cut ends and was removed. In Fig. 
11 eight days after section, four groups of tentacles, a, b, c, d, 
have appeared at the oral end (in Fig. 11 the line of union is at 
the equator and the oral end with the tentacles is just below it.) 
Fig. 12 shows the piece six days later, i. e., fourteen days after 
section. ‘The shape of the piece has changed so that the long axis 
is at right angles to its previous position. The group a has five 
more tentacles than before, three of them aboral, and the group b 
has two aboral tentacles, the groups c and d have merely increased 
in length. This case differs from both the preceding in that the 
tentacles of the groups a and b form almost complete circles: if 
the tentacles on the aboral side of the line of union were of the 
