330 University of California Publications. [ ZooLocy 
III.— August 5, No. 7. Stem with 11 hydranths and termi- 
nal bud. 
Pedicels 1-2 with 6 annuli 
Pedicel 3 with 2 annuli 
Pedicel 4 with 5 annuli 
Pedicel 5 with 3 annuli 
Pedicel 6 with 1 annulus 
Pedicel 7 with 2 annuli 
Pedicels 8-11 with 1 annulus 
August 8, 3:30 p.m. Heteromorphie stem with three annular 
basal segments, a long intermediate segment and one annulus 
immediately below the terminal bud. 
IV.—August 5, No. 10 (see above). 
August 8, 4:30 p.m. Heteromorphie stem differing but 
slightly from preceding (III), surmounted by a hydrotheea 
(fig. 4). 
Latter small, and diaphragm not apparent. Hydranth at- 
tached to wall by a number of amoeboid strands which are com- 
mon along the stem but are seldom met with in hydrotheca. 
V.—August 5, No. 9 (see above). 
August 8, 4:15 p.m. Heteromorphie stem with 3 basal an- 
nuli, a long stem segment and a poorly defined annulus imme- 
diately below the hydrotheca. Shoulder process on side of long 
stem segment carrying growing stalk of normal type. 
VI.—August 5, No. 5 (see above). 
August 11. Heteromorphic shoot with terminal hydrotheca. 
Three basal annuli and a very long non-annulated stem segment 
which passes directly into the hydrotheea, without an interven- 
ing constriction or annulus. 
Disregarding for a moment the stalk, the number of annuli 
occurring immediately below the hydrotheca is typical of the 
latest formed (distal) region of the normal stem in 4 of the 
above 6 cases. In the other 2 cases, the number is larger than 
the typical distal number on the same stem but is smaller than 
the proximal number on one of the stems (II). It exceeds the 
proximal number on the other stem which, however, is excep- 
tionally small (1). The tendency to develop according to the 
