302 
PACIFIC SCIENCE, Vol. VIII, July, 1954 
Fig. 14. Salpa maxima, aggregate form, a. Larger specimen, dorsal aspect; b, smaller (echinate) specimen, dorsal 
aspect; c, same specimen as b, ventral aspect of test; d, same specimen as b, schematic cross section of test at level 
of M IV; e, same specimen as b, left aspect of ciliated groove and associated structures. 
anteriorly, turning posteriorly and usually 
rather closely encircling gut, then extending 
anteriorly again; a ventral posterior attach- 
ment organ usually present behind gut (Eig. 
AGGREGATE FORM: Over 10 specimens ex- 
amined with length range of 10-112 mm. 
(Eig. 14). Test: In the typical (.^) form, thick 
and smooth (Fig. 14^) in all areas; gut swell- 
ing prominent; end projections long or short; 
test bearing neither serrations, grooves, nor 
ridges; weak dorsal longitudinal depression 
and large ventral elevation present; gut cavity 
large, its margin smooth except for a V- 
shaped depression posteriorly. The most com- 
mon form among POFI specimens is asym- 
metric, echinate, and smaller than the above- 
described form (Fig. 14^). Test thick in all 
areas; dorsal longitudinal depression limited 
by dorsal limiting elevations; transverse de- 
pression at base of upper lip; posteriorly a 
sparsely serrated dorsolateral ridge with a 
sparsely serrated lateral ridge ventral to it; a 
dorsal transverse groove posterior to cloacal 
aperture with a longitudinal groove extending 
from it posteriorly on the end projection; few 
spines on or near gut swelling; nonserrated 
ventral ridge on gut swelling; oblique groove 
in front of gut swelling; remaining anterior 
test thin, forming a shallow depression; at- 
tachment organs prominent, large; end pro- 
jections broad, relatively short. Muscles: Six 
present, forming two groups, M I-IV and 
V-VI; IV and V may approach laterally and 
