282 
PACIFIC SCIENCE, Vol. VIII, July, 1954 
All body muscles separate, parallel (Trau- 
stedt, 1885) Thalia longicauda 
35(33). Not more than first four body mus- 
cles forming complete rings 
Ritteriella amboinensis 
M I-VI forming complete rings (Thomp- 
son, 1948) Ihlea magalhanica 
36(31). Intestine straight, extended poste- 
riorly Ritteriella picteti 
Intestine coiled, not extended 37 
37(36). Projections of test or tentacles ex- 
tending beyond body outline 38 
No projections of test extending beyond 
body outline 39 
38(37). Two posterior projections present; 
9 to 13 body muscles present, asym- 
metrical Metcalfina hexagona 
No posterior projections but with two 
to many tentacles; body muscles few 
(5), symmetrical 
Traustedtia multitentaculata 
39(37). Four body muscles present 
Pegea confoederata 
More than 4 body muscles present. .40 
40(39). Elaeoblast or its cavity present in 
mature specimens; ciliated groove form- 
ing a loop Salpa maxima 
Elaeoblast present only in embryos; 
ciliated groove simple in immature spec- 
imens 41 
41(40). M I“IV converging to form a group 
Weelia cylindrica 
M I-III and VIII-x converging, or are 
parallel Salpa fusiformis 
Family SALPIDAE 
The definition of the family by Ihle (1935) 
is followed here chiefly. 
Planktonic Thaliacea with main body axis 
longitudinal, covered with a transparent test. 
Mouth opening anterior, cloacal opening pos- 
terior, dorsal or terminal. Body musculature 
consists of usually ventrally interrupted mus- 
cles but may include complete rings or dor- 
sally interrupted muscles as well. Special 
mouth and cloacal musculature present. 
Pharyngeal and cloacal cavities separated by 
a "gill bar” lying between two large gill slits; 
gill bar extending from anterodorsal surface 
to esophagus located posteroventrally. An 
alternation of generations exists between the 
sexual blastozooid (aggregate or gregarious 
form) and the asexual oozooid (solitary form). 
The oozooid bears ventrally a proliferating 
stolon on which the blastozooids arise. The 
blastozooid produces one or several embryos 
on the cloacal wall which become oozooids. 
The family Salpidae consists of two distinct 
groups of genera. I propose to give these 
groups the status of subfamily: the Cyclosal- 
pinae including Cyclosalpa and Helkosalpa, the 
former being the type genus, and the Salpinae 
including all other genera of the Salpidae, 
Salpa being the type genus. 
CYCLOSALPINAE subfam. nov. 
The subfamily Cyclosalpinae may be dis- 
tinguished by the following characteristics: 
(1) in the solitary form, the intestine accom- 
panies the gill forward, being united with it 
over most of its length; (2) there are light 
organs present in all solitary forms except 
C affinis, and here one is probably present 
(see description); (3) in the aggregate form, 
the gut is either an extended tube or a loosely 
formed loop, never a compact "nucleus”; 
(4) the aggretate forms are attached by a 
single peduncle or by a single large attach- 
ment process. 
Genus Cyclosalpa Blainville, 1827 
Solitary form with six body muscles, gre- 
garious form with four. In the solitary formt 
longitudinal muscles absent or, if present, no, 
continuous with M I. Intestine coursing ob- 
liquely with gill bar in the solitary form, but 
not forming a rectum. Intestine either straight 
or forming an open circle in the aggregate 
form. Only one attachment organ, the pe- 
