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PACIFIC SCIENCE, Vol. XII, October, 1958 
Fig. 1 . Doliolina obscura n. sp. A, Animal from left side: a 5 mm. gonozooid. B, Alimentary organs and gonads 
from left side. C, Alimentary canal. D, Ventral protuberance, phorozooid. E, Aberrant form showing arrangement 
of muscles viewed ventrally. 
Abbreviations: I— VIII, body muscles; an., anus; c.g., ciliated groove; d.g., dorsal ganglion; ed., endostyle; 
g., gill septum; ht., heart; int., intestine; oe.op., oesophageal opening; ov., ovary; pb., peripharyngeal band; st., 
stomach; t., testis; v.d., vas deferens. 
situated in the third intermuscular zone with 
its posterior edge at the center of the zone. 
The gill septum ( g .) is sigmoid in shape ex- 
tending from the dorsal to ventral position of 
muscle V, (Fig. la). At the lower flexure the 
anterior margin reaches slightly beyond the 
middle of the fourth intermuscular zone. At 
the upper flexure the posterior margin extends 
slightly beyond the posterior margin of mus- 
cle VI. The median crest of the gill septum is 
slightly displaced to the right side in the 
ventral half of its course, where the massive 
alimentary organs and gonads are situated. 
There are about 40 elongate stigmata. 
The alimentary organs and gonads are sur- 
rounded by densely aggregated corpuscles 
which make it very difficult to examine the 
structure of the organs closely. These cor- 
puscles are probably reddish orange when the 
animal is alive. Staining of the specimens 
with Rose Bengal makes it somewhat easier 
to study this portion of the body. 
The oesophageal opening (oe. op.) is lo- 
cated near the center of the circle described 
by muscle V. The stomach (st.) is located on 
the sagittal plane of the body and is roughly 
oval in outline. The intestine forms a simple 
loop and ends with the anus (an.) at a posi- 
