406 LILY HUIE. 
The Cytoplasm shows, as regards vacuolation, great variety 
in material of this stage. The specimen from which the figure 
(5) was drawn is more vacuolated than most of the cells, which 
latter rather correspond in this respect to earlier stages already 
described. All other details remain as in the earlier stages 
(figs. 4 and 2), except that there are no blue granules, and the 
blue “ corpuscles” are rare. 
The Nucleus becomes less distinctly defined in outline. 
Other details remain as in the last specimen described. 
The Nuclear Chromosomes are distinctly larger and more 
conspicuous than in unfed specimens. 
The Nuclear Plasm shows enlarged pale spaces which, com- 
bined with the less full and rounded contour, give to the 
nucleus a slightly attenuated appearance as compared with 
unfed specimens. In colour it resembles the earlier spe- 
cimens. 
The Nucleolus is unchanged from earlier stimulated spe- 
cimens. 
Effect of Stimulation for Twenty Minutes to One 
Hour on the Apical Gland-cells. Fig. 6. 
Notr.—It is extremely difficult to decide which is the 
sequence of the three types next to be considered. They are 
all characteristic of glands which have been active for periods 
intermediate between twenty minutes and four hours, and it is 
by no means certain that the order here adopted is the correct 
one. The type shown in fig. 6, which was taken from a -ten- 
tacle stimulated for one hour, was seen also in a tentacle fed 
for only twenty minutes. I have, therefore, placed it before 
the other two. 
The Cell Wall is pale blue-purple. In many cells the walls 
appear less turgid than in controls, being often somewhat 
crooked or uneven; this is especially the case in the lateral 
walls. 
The Cytoplasm shows considerable vacuolation, especially 
in the outer third of the cells, but not more so than in some 
previously described earlier stages. Round the nucleus the 
