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PACIFIC SCIENCE, VoL VI, April, 1952 
e, stolons. Scale applies to all figures. 
separated and arise on any side and at no 
constant angle, although many come off at 
nearly right angles, subsequently turning up- 
ward to about 45°. Well- developed colonies 
may be a tangled mass of twisted zooids, and 
there is sometimes fusion of the outer walls 
where two zooids come in contact, producing 
a false anastomosis. The primary axial zooids 
and all subordinates show eight distinct 
longitudinal ribs which become obscure at 
the bases of primary zooids and do not con- 
tinue on the stolons. The outer surface is 
covered with an exceedingly thin, horny 
cuticle, and in the gastrovascular cavity there 
is a horny subepithelial layer which is thick- 
ened to form delicate horny ribs along the 
septal origins. These ribs may be stripped out 
in dissection just as in Telesto. The anthoco- 
diae are fully retractile within the body tubes 
by virtue of the thin, introversible neck zone 
in which spicules are less densely distributed; 
their tentacles are 0. 8-0.9 mm. in length and 
contain a layer of transversely placed narrow 
rods which are somewhat bent and have ir- 
regular margins (Fig. 6 a ) . The tentacle spic- 
ules project into the pinnules, which number 
about 12 on each side of a tentacle. The ten- 
tacular deposits are 0.08-0.16 mm. in length. 
In the neck zone are found short, lumpy rods 
0.06-0.08 mm. in length, along with some 
