Pacific Salpidae — YoUNT 
319 
Fig. 25. Pegea confoederata, aggregate form, left side. 
can see no justification for considering the 
hicaudata form to be even a variety, and much 
less a distinct subspecies, as Metcalf has 
done.” Although I have seen only a few (all 
very small) specimens of this form, and thus 
little intergradation, Sewell’s reckoning is 
considered probably correct here, and the bi- 
caudate individuals are not given subspecific 
status. 
Genus Traustedtia Metcalf, 1918 
Solitary form with 7 to 25 tentacles, aggre- 
gate form with two or three. Solitary form 
with five, gregarious form with four, body 
muscles that are widely interrupted ventrally. 
One species, Traustedtia multitentaadata. 
Traustedtia multitentaculata 
(Quoy and Gaimard) 1834 
Figs. 2(sa-e, 21a-d 
Salpa multitentaculata Quoy and Gaimard, 
1834: 596; Bomford, 1913: 244. 
Salpa henseni Traustedt, 1893: 9- 
Salpa verrucosa Apstein, 1894^; 12. 
Salpa {Traustedtia) multitentaculata Metcalf, 
1918: 147; Oka, 1921: 1; Sewell, 1926: 105. 
Salpa {Traustedtia) multitentaculata hicristata 
Metcalf, 1918: 143. 
Salpa {Traustedtia) radiatayittC2i\{, 1918: 152. 
Salpa {Traustedtia) henseni Oka, 1921: 10-14. 
Traustedtia multitentaculata Ihle, 1935: 527- 
529; Tokioka, 1937:230; 1938:234; Thomp- 
son, 1948: 147. 
SOLITARY form: Five specimens examined 
with length range of 2-16 mm. (without pro- 
jections) (Fig. 2Ga). Test: Thick, especially on 
crests, gut swelling, chin, and lips; in dorsal 
view, a raised median depression extending 
posteriorly to form the cloacal flap, anteriorly 
to the greatly thickened transverse ridges of 
the upper lip; continuing anterolaterally with 
a vertical elevation that joins its fellow of the 
opposite side midventrally under the chin; 
dorsal depression limited by grooves or de- 
pressions on each side which form the bases 
of the prominent dorsal limiting ridges 
(crests) ; crest covered with peculiarly shaped 
spines (see Fig. 26c, also Apstein, 1894, Taf. 
II, fig. 13), continuing with one break pos- 
teroventrally below and behind cloacal open- 
ing, meeting fellow of opposite side there; 
cloacal flap bearing a small projection on each 
side; each crest bearing a moderately long 
tentacle directed posteriorly; a postero ventral 
unpaired tentacle, which is doubtless the re- 
mains of the elaeoblast attachment as sug- 
gested by Thompson, projecting posteriorly; 
10 other paired tentacles on posterior lateral 
to ventral anterior surface, some of which 
may be quite long; thus, a total of 25 tentacles 
present in this specimen; chin and gut swell- 
ing prominent; ventral lip bearing several 
ordinary spines and a median row of peculiar 
flattened spines (Fig. 2Gd)\ dorsal lip with 
two high transverse ridges at base; internal 
surface of dorsal lip bearing a series of longi- 
tudinal and transverse grooves and ridges that 
are serrated; chin smooth or serrated. Muscles: 
Three main muscle masses— first including 
fused M I-III, second large M IV, and third, 
M V and x; all except V branching on each 
side; M IV and V joining ventral cloacal 
muscles; all muscles extending only a short 
distance laterally. For descriptions of mouth 
and cloacal muscles, see Metcalf (1918), Oka 
(1921), Sewell (1926), and Thompson (1948). 
Ciliated groove: Simple, straight, located di- 
rectly under ganglion and eye. Viscera: Gut 
forming an elongate loop, in state D of Ihle 
and Ihle-Landenberg (1933) (Fig. 26^); stolon 
forming a loose circle around gut; endostyle 
extending anteriorly to base of ventral lip. 
