Pacific Thaliacea — Tokioka and Berner 
Pacific material. They have an average length 
of about 10 mm. The test is very soft, of 
moderate thickness, and is easily stripped 
from the animal. All eight body muscles are 
complete. Muscles VII and VIII are very nar- 
row and muscle VI is somewhat narrower 
than muscles TV,. The third intermuscular 
zone is the widest and the seventh is the 
narrowest. 
The endostyle (ed) extends anteriorly to 
beyond the second intermuscular zone and 
posteriorly to the middle of the fourth zone. 
The anterior margin of the peripharyngeal 
band {p.b.) approaches the posterior margin 
of muscle I. The ciliated groove (r.g.) is situ- 
ated in the center of the second intermuscular 
zone. The dorsal ganglion (d.g.) is located in 
the third intermuscular zone near the posterior 
margin of muscle III. The gill septum (g.) 
attaches at muscle IV dorsally at the middle, 
or slightly beyond, the fourth intermuscular 
zone ventrally. It bears about 50 pairs of 
elongate stigmata. 
The loop of the alimentary canal is situated 
321 
vertically in the fifth intermuscular zone with 
the oesophageal opening (oe. op.) on the 
sagittal plane. The stomach is elongate and 
rectangular in outline with the anterior mar- 
gin slightly convex. The hind-stomach is very 
distinct with an extreme constriction be- 
tween it and the intestine. The anus is located 
near the cardiac end of the stomach. 
The ovary ( ov .) is situated just in front of 
muscle VII. The testis ( t .) projects anteriorly 
along the left side of the endostyle with its 
anterior portion often curving dorsally along 
the posterior side of the peripharyngeal band. 
Doliolina undulataTokioka and Berner 1958 
Fig. 4 
Doliolina undulata Tokioka and Berner, Pacific 
Sci. 12(2) : 135—138. 
Several more specimens of D. undulata have 
been found in the material from the Shellback 
Expedition. In some of these, most frequently 
small mature specimens, the testis is stretched 
obliquely between muscles V and VI with 
