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PACIFIC SCIENCE, Vol. XII, April, 1958 
The endostyle (ed.) is very long, extending 
anteriorly nearly to muscle II and posteriorly 
to the anterior margin of muscle V. The an- 
terior margin of the peripharyngeal band 
(p.b.) extends forward almost to muscle I. 
The ciliated groove (c.g.) is situated near the 
middle of the second intermuscular zone. The 
dorsal ganglion is situated in the third inter- 
muscular zone, its posterior edge is at the 
middle of the zone. The gill septum extends 
from the middle of the fourth intermuscular 
zone dorsally, obliquely back to the level of 
muscle VI and then obliquely forward to the 
level of muscle V ventrally. It bears 30-40 
pairs of elongate stigmata. 
The oesophageal opening (oe.op.) is lo- 
cated approximately on the longitudinal axis 
near the posterior margin of muscle V. The 
stomach (st.) is located vertically at the same 
level; it is roughly rectangular in outline, 
slightly curved with the convex side forward. 
The intestine forms a simple loop and ends 
with the anal opening near the cardiac portion 
of the stomach and on a level with the middle 
of the fifth intermuscular zone. The hind 
stomach and mid-intestine are rather dis- 
tinctly marked. There appears to be a thin 
short vessel connecting the pyloric end of the 
stomach with the middle of the posterior 
branch of the intestinal loop. 
The ovary (ov.) is situated on a level with 
muscle VI, slightly to the right of the mid- 
ventral line. The testis (tes.) is somewhat 
sausage-shaped. It extends, with an undulat- 
ing course, along the left side of the body 
between muscle V and the genital pore. There 
are a number of small cell groups scattered 
over the ventral half of the sixth intermuscular 
zone and on a small portion of the seventh 
intermuscular zone. 
REMARKS 
The oozooid, trophozooid, and the phoro- 
zooid of this species are unknown. 
Gonozooid: At a glance the present new 
species may be confused with D. intermedium 
(Neumann, 1905: 211). The longer endostyle 
in D. undulatum can be used as a good indi- 
cator to distinguish it from D. intermedium. 
In most of the specimens of D. intermedium 
collected in the Shellback area the endostyle 
reaches only slightly beyond the middle of 
the second intermuscular zone and its pos- 
terior end is located near the middle of the 
fourth intermuscular zone. The mid-ventral 
interruption of muscle VII is also unique in 
D. undulatum. Dolioletta mirabilis is the only 
doliolid, outside the genus Doliopsoides, which 
has an interrupted muscle band. In this case 
there is a mid-ventral interruption of muscle 
VI below the gut. The characteristic appear- 
ance of the testis, from which the specific 
name of the new species has come, is also 
unique and serves to separate the species from 
all others in the genus. 
The following material, upon which part 
of the descriptions herein are based, has been 
deposited in the U. S. National Museum: 
1. Doliopsoides horizoni , gonozooids, SYN- 
TYPES, 3 specimens USNM Cat. No. 11368. 
These specimens were poorly preserved and 
it was felt impossible to designate a type from 
among them. They are all from station SB- 
115. 
2. Doliolina undulatum , gonozooid, HOLO- 
TYPE, 1 specimen USNM Cat. No. 11369. 
3. Doliolina undulatum , gonozooids, PARA- 
TYPES, 4 specimens USNM Cat. No. 11370. 
REFERENCES 
Garstang, W. 1933. Report on the Tunicata. 
Part I. Doliolida. British Antarctic ( Terra 
Nova) Exped. of 1910, Zool. 4: 195-251. 
Kruger, H. 1939- Die Thaliaceen der "Me- 
teor” Expedition. Wiss. Ergeb. Deut . Atlan- 
tische Exped. " Meteor ’ of 1925-1927 13(2): 
111-152. 
Neumann, G. 1906. Ergeb. Deut. Tiefsee- 
Exped. {Valdivia). XII, Doliolum , pp. 93- 
243. 
Sewell, R. B. S. 1953. The pelagic Tunicata. 
Sci. Rpt. John Murray Exped. X(l): 1-90. 
