366 CoM Chi 
is nearest the line of union, 1. e., nearest the original aboral end of 
the body-wall is the shortest tentacle of the group, though it is 
at the same time the most oral. 
This piece remained in good condition for nearly a month, an 
exceptionally long life for such pieces, before decrease in disten- 
sion became marked, but after this collapse gradually occurred 
and death followed. 
26 
Fics. 24-27 
VIL Figs. 24 to 27. This piece like No. VI was from the mid- 
dle region of the body and its mesenterial organs were removed 
in large part before closure. Fig. 24 shows the piece eleven days 
after section and Fig. 25 nineteen days. The line of union in 
both figures is above the equator as is indicated by the dotted line, 
and the tentacle groups arise just below it, i. e., on the original 
oral end of the body-wall. In Fig. 24, three groups, a, 6 and c, 
