Eastern Pacific Tunicates — Berner 
249 
Dorsal tubercle: (Fig. 2) The dorsal tubercle 
is much twisted, forming an almost closed 
irregular ring. 
Internal structure: The gut approaches in 
shape most closely that found in the aggre- 
gate generation of C. a finis. It forms a large 
loop which lies outside the body in a large 
protuberence, the postabdomen. The wide 
.5 
MM 
Fig. 2 . Cyclosalpa strongylenteron, dorsal tubercle. 
Hairing oesophageal opening is on the right 
side of the body at the base of the gill. The 
anus is on the left side slightly above the 
oesophageal opening. There is no stomach- 
like enlargement of the intestine. The caecum, 
similar to that in C. bakeri , is extremely well 
developed, originating just behind the open- 
ing of the oesophagus and extending back 
at least as far as the end of the postab- 
domen. The duct of the intestinal gland, 
which empties into the intestine just after the 
origin of the caecum, passes across the gut 
loop and branches over the distal portion of 
the intestine. The endostyle extends from be- 
low the bifurcation of the oral retractor to the 
area of the oesophageal opening. The heart 
is below and slightly anterior to the opening 
of the oesophagus. The ganglion is quite 
similar to that of the aggregate C. pinnata. 
The testis is in a slender pouch extending 
posteriorly from the region midway around 
the gut loop. It may be as much as three 
times as long as shown in Figure 1. The vas 
deferens extends across the gut loop and up 
into the region just anterior to the atrial 
opening. The ovary lies just behind muscle 
III. The oviduct passes forward to a point 
near the anterior border of that muscle. 
Cyclosalpa strongylenteron, solitary generation 
The solitary generation of this species has 
to my knowledge been taken only twice: 
seven embryo individuals, with well- developed 
stolons, at MLR station 11-120.80 and one 
embryo at MLR station 35-110.60. These all 
have the same granular appearance seen in 
some aggregate individuals. Here the granular 
appearance is so well developed that it con- 
ceals many details of structure. So little of the 
details of the body muscles of the solitary 
generation can be determined, due to con- 
cealment by this granulation, that it is im- 
possible to compare them, except in a general 
way, with those of existing species. 
Body: (Fig. 3) Length 25 mm. The body is 
cylindrical with the oral and atrial openings 
terminal. There are two well-developed ventral 
languets below and just posterior to the oral 
opening. The test appears more ridged than 
that of the aggregate form. 
Fig. 3. Cyclosalpa strongylenteron, embryo of solitary 
generation. AO, Atrial opening; DT, dorsal tubercle; 
GG, dorsal ganglion; H, heart; K, eleoblast; M, oral 
opening; PL, placenta; ST, stolon; vl, ventral languets. 
