Pacific Salpidae — YouNT 
287 
527-529; Thompson, 1948: 114; Tokioka, 
1951: 183. 
Cydosalpa floridana Apstein, 1906^; 248; 
1906A 162. 
[non] Salpa floridana Apstein, 1894^’.' 9- 
Salpa {Cydosalpa) Metcalf, 1918: 37. 
SOLITARY form: One specimen examined 
with length of 34 mm. (Fig. 6^, h). Test: Thin, 
flabby, glutinous; closely attached to mantle; 
no definite elevations or depressions; pear- 
shaped with posterior end smallest. (This does 
not agree with the figure of Metcalf, which 
shows the test far separated from the mantle.) 
Musdes: Six body muscles, of which M I joins 
mouth muscles laterally and ventrally; all 
body muscles and x dorsally interrupted (Rit- 
ter, 1905, and Metcalf, 1918, say that x is 
sometimes complete dorsally), all except x 
ventrally interrupted (the above-named au- 
thors say that x is also ventrally interrupted) ; 
ventrally, y fusing with its fellow of the op- 
posite side, extending shortly anteriorly be- 
tween the gut caeca; dorsally M VI extending 
anteriorly almost to level of M II (to level of 
M IV according to Ritter and Metcalf); left 
and right anterior dorsal extensions of M VI 
remaining distinct. Ciliated groove , ganglion and 
eye: Ciliated groove forming an open U with 
left horn extended farther anteriorly; ganglion 
and eye just anterior to M I. Viscera: Eso- 
phagus opening at region of M VI ventrally; 
intestine accompanying gill antero-obliquely, 
anus opening behind eye level; two equally 
long, laterally compressed caeca projecting 
posteriorly; stolon held within a mantle tube 
which opens at level of M I-II; light organs 
large and distinct, four on one side, three on 
other in POFI specimen; each located laterally 
over a body muscle (previous reports show 
five large light organs and one small anterior 
one, between body muscles). 
This animal most closely resembles the polae 
form of Cydosalpa pinnata (according to the 
description of Sigl, 1912^?, and the statement 
of Thompson, 1948). It can be distinguished 
from that form by the nonfusion of the two 
M VI dorsally, and by the fact that in C 
hakeri the caeca are of equal length, whereas 
in C pinnata they are unequal. 
AGGREGATE FORM: Eight Specimens exam- 
ined with length range of 7-9 mm. (Fig. 6c). 
Test: No definite elevations or depressions; 
flabby, thin except around posterior projec- 
tions; either closely applied or far separated 
from mantle; attached at cloacal siphon and 
mouth; two prominent posterior end projec- 
tions of thicker test present; the whorl of 
2 ooids released from the stolon covered by 
an outer coat of test, including seven zooids 
both in my specimens and in Thompson’s 
figure (1948, pi. 42). Musdes: Two main mus- 
cle groups dorsally; each dividing laterally 
into several branches; anterior group joining 
mouth muscles; peduncle muscles three on 
each side, anterior one from M C, lateral one 
from M I-II, and a short posterior one from 
M III which extends anteroventrally toward 
peduncle; muscles of posterior muscle mass 
continuous ventrally; muscle structure asym- 
metric. Ciliated groove, ganglion and eye: All 
anterior to M I; ciliated groove forming a 
crescent rather far anterior to ganglion and 
Fig. 6. Cydosalpa hakeri. a. Solitary form, dorsal 
aspect; b, solitary form, ventral aspect {a and b schem- 
atic; length of animal, 34 mm.); c, aggregate form, left 
side. 
