Pacific Salpidae — YoUNT 
323 
the same relationships exist as in the 2-milli- 
meter specimen described above, except the 
posterolateral projections (6 of Metcalf) are 
true tentacles and of the same length as the 
body. 
In the largest specimen examined (16 mm.) 
there are 25 tentacles, as described above. 
Thus, it is my belief that the tentacles also 
do not show variations that would lead to 
the separation of any of Metcalf’s forms from 
the main species. It would be desirable to 
re-examine some of the larger specimens (for 
example. Oka’s specimen of 23 mm. length), 
described as possessing 13 or fewer tentacles, 
with the use of toluidin blue. If these large 
specimens actually possess only 13 or less 
tentacles, then T. henseni should probably be 
recognized also, as Oka (1921) has done. 
All aggregate forms described to the present 
time have been regarded as only one species, 
T. multitentaculata, and all POFI specimens 
agree with this conclusion. 
Genus Thalia Blumenbach, 1810 
Solitary form with five body muscles of 
which the first four form rings; aggregate 
form with five ventrally interrupted body mus- 
cles, with a short endostyle. Languet present 
in both forms ventral to the ciliated groove. 
Two species, Thalia democratica (type) and 
T. longicauda. The latter species has not been 
found in the collections studied. 
Thalia democratica (Forskal) 1775 
Figs, l^a-e, 29a-f 
Salpa democratica Forskal, 1775: 113; Bom- 
ford, 1913: 244. 
Salpa mucronata Forskal, 1775: 114. 
Biphora democratica Bruguiere, 1789: 180. 
Biphora mucronata Bruguiere, 1789: 181. 
Salpa cyanogaster [.^] Peron and Lesueur, 1807: 
fig. 3. 
Thalia Ungulata Blumenbach, 1810: (30). 
Salpa spinosa Otto, 1823: 303. 
Fig. 28 . Thalia democratica, solitary form, a, Echinate form, dorsal aspect; b, another specimen, test, right side; 
c, same specimen as b, schematic cross section of test at level of M III; d, same specimen, test, ventral surface; 
e, nonspiny form,, dorsal aspect. 
