Pacific Salpidae — YoUNT 
317 
The stolon individual (aggregate form) was 
well figured by Traustedt (1885) and Tokioka 
(1937). The preceding description (solitary 
form) agrees with their reports except for 
minor details. 
Genus Pegea Savigny, 1816 
Four ventrally interrupted body muscles in 
both forms. Aggregate form with eight prom- 
inent, symmetrically arranged attachment 
organs. 
One species, Pegea confoederata. 
Pegea confoederata (Forskal) 1775 
Figs. 24, 25 
Salpa confoederata Forskal, 1775: 115; Bom- 
ford, 1913: 244. 
Biphora confoederata Bruguiere, 1789: 181. 
Salpa gihha [?] Bose, 1802: 178. 
Salpa soda Bose, 1802: 180. 
Salpa scutigera Cuvier, 1804: 577. 
Salpa octophora Cuvier, 1804: 577. 
Salpa vivipara [.^] Peron and Lesueur, 1807: 
pi. 31, fig. 3. 
Pegea octofora Savigny, 1816: 235. 
Salpa ferruginea Chamisso, 1819: 23. 
Salpa informis Quoy and Gaimard, 1824 [fide 
Thompson, 1948]. 
Salpa bicaudata Quoy and Gaimard, 1827 : 225. 
Salpa laevis [.^] Lesson, 1830: 273. 
Salpa nephodea [?] Lesson, 1830: 275. 
Salpa dolium [.^] Quoy and Gaimard, 1834: 
575. 
Salpa femoralis [.^] Quoy and Gaimard, 1834: 
577. 
Salpa scutigera-confoederata Traustedt, 1885: 
362; Oka, 1915: 31. 
Salpa quadrata Herdman, 1888: 84. 
Pegea confoederata Lahille, 1890: 11; Ihle, 
1935: 527-529; Tokioka, 1937: 230; Ihle 
and Ihle-Landenberg, 1938^.' 107; Thomp- 
son, 1948: 143. 
Salpa (Pegea) scutigera-confoederata Apstein, 
1894^.’ 42. 
Salpa (Pegea) scutigera-confoederata forma hi- 
caudata Apstein, 1894<^.‘ 43. 
Salpa confoederata-scutigera Ritter, 1905 : 80. 
Salpa (Salpa) confoederata Streiff, 1908: 32. 
Salpa (Pegea) confederata Metcalf, 1918: 127; 
Berrill, 1950: 297. 
Salpa (Pegea) confederata bicaudata Metcalf, 
1918: 139. 
Salpa (Pegea) confoederata Sewell, 1926: 100; 
Stiasny, 1926: 448. 
SOLITARY form: More than 10 specimens 
examined with length range of 14-85 mm. 
(Fig. 24). Test: There are two different forms 
of this animal, the one characteristic of larger 
specimens, the other of smaller specimens. 
In the large form, test usually pear-shaped, 
smaller posteriorly, thick on ventral surface, 
especially over gut; dorsally a broad, slightly 
thickened elevation extending from upper lip 
to cloacal opening; this elevation limited lat- 
erally by one dorsolateral groove on each side; 
test very thin and flabby on lateral surface, 
therefore with no permanent shape; a prom- 
inent ventral elevation limited on each side 
by a ventrolateral groove; gut swelling prom- 
inent, produced as an additional swelling over 
the elaeoblast; test in all specimens examined 
not spiny, but earlier investigators have noted 
serrations on some specimens. In the small 
form, test pear-shaped, thick all over, firm, 
smaller posteriorly than anteriorly; on dorsal 
surface a shallow depression or deep groove 
extending from upper lip to cloacal opening; 
this depression limited by dorsal elevations; 
laterally a shallow depression extending from 
angle of mouth almost to region of gut; ven- 
trally a rather strong elevation extending from 
lower lip almost to cloacal opening; this ele- 
vation further raised over elaeoblast as a disc- 
like bulge and bearing a far anterior small 
circular depression in which is located an at- 
tachment organ. The smaller form agrees 
more closely to the type set up by Stiasny 
(1926), but individuals are often different 
from his type. Thus, this animal deviates from 
the conclusion set up earlier here; that is, 
even though its test is firm and there may be 
grooves (but no ridges), these grooves prob- 
ably are not permanent, and a definite "type” 
