VOL. 2] Ritter-——The Pelagic Tunicata. 81 
Salpa (Pegea) octofora, Sav., 1816, p. 124, Pl. 24, fig. 1.1 and 1.2. 
Salpa ferruginea, Cham., 1819, p. 23, figs. 10A-D. 
Salpa scutigera-confoederata Vogt, 1854, p. 6. 
Salpa scutigera-confoederata Traustedt, 1885, p. 362, Pl. II, 
figs. 23, 24. 
Salpa scutigera-confoederata Herdman, 1888, p. 84, Pl. IX, fig. 9. 
Pegea confoederata Lahille, 1890, p. 12, text, figs. 1, 2, 3A, 3B. 
Salpa scutigera Brooks, 1893, pp. 6-16, anatomy; Pl. IV, figs. 1-7 
Salpa confoederata Apstein, 1894, p. 12, Pl. Il, fig. 16. 
(a) Solitary (asexual) generation.—As I have seen but a 
single small specimen of this generation, I neither figure it nor 
give a diagnosis of it. But these may be the less disadvantage- 
ously omitted from the the fact that the two generations are so 
very similar. The chief differences between them are that the 
general body form is relatively shorter and more rotund in the 
solitary generation, and that the atrial siphon projects farther 
backward from the level of the nucleus in the solitary than in 
the aggregate generation. 
ANY a 
anh Mins — 
Fig. 23.—S. confoederata-scutigera, aggregate generation. 
(b) Aggregate (sexual) generation— Fig. 23. Agerega- 
tions remaining intact at least until zooids are 25 mm. long, but 
at this stage falling apart with great ease. Body cylindrical, 
straight, and regular, the regularity broken only by a slight con- 
striction behind the branchial orifice, by a pair of low, lateral 
prominences in this constriction; and a pair of low, broader, 
blunter lateral test tubercles at the posterior end, into which a 
double outpocketing of the mantle on each side projects. Test 
rather delicate, without specially thickened areas, transparent, 
the iron rust colored pigment characteristic of the species being 
mostly confined to the mantle. 
Branchial orifice terminal, lips not very prominent; atrial 
orifice but little smaller than branchial, directed slightly upward, 
with well defined lips. Largest zooids, 70 mm. long. <A _ brick 
