Pacific Salpidae — YoUNT 
295 
testis located posterior to gut, unlike all other 
Salpinae. 
This form, because of its small size, is easily 
confused with Thalia democratica agg. The 
presence of the widely turned endostyle, 
prominent gut with posterior testis, and dorsal 
and ventral muscle masses make it readily 
distinguishable. 
Previously this species has been considered 
rare, although, as Apstein (1894) and Thomp- 
son (1948) stated, the very small aggregate 
form may easily be overlooked, especially 
among large numbers of Thalia democratica 
agg. The species is common in the POFI 
collections; in one plankton sample, for ex- 
ample, there were 8 solitary and 38 aggregate 
zooids. These animals are delicate and usually 
fragmented. Only two specimens of the soli- 
tary form retained the snout. The solitary 
zooid can be positively identified by the 
longitudinal muscles coursing parallel to the 
endostyle; the aggregate zooids must be ex- 
amined closely, preferably stained, for correct 
identification. Fragments should not be over- 
looked but stained and examined, as the snout 
is useful as a recognition character only if the 
animal is whole. The high muscular activity 
of the solitary zooid was shown by the fact 
that in many specimens the body was turned 
completely inside out. 
Genus Ihlea Metcalf, 1919 
Solitary form with six or seven body mus- 
cles which form complete rings. Aggregate 
form with five or six body muscles which 
form complete rings or are ventrally inter- 
rupted; these muscles are arranged asym- 
metrically. 
Two species, Ihka punctata (type) and 1. 
magalhanica. The latter species has not been 
found in the POFI collections. 
Ihlea punctata (Forskal) 1775 
Fig. 10^-c 
Salpa punctata Forskal, 1775: 114; Ihle, 1912: 
34. 
Biphora punctata Bruguiere, 1789: 181. 
Salpa musculosa [?] Herdman, 1888: 64. 
Salpa musculosa-punctata Traustedt, 1893: 6. 
Salpa asymmetrica Fowler, 1896: 994; Ihle, 
1912: 35. 
Salpa {Salpa) punctata Streiff, 1908: 25. 
Salpa {Apsteinia) punctata Metcalf, 1918: 72 
(see also Metcalf, 1919). 
Salpa {Apsteinia) asymmetrica Metcalf, 1918: 
78, 183 (see also Metcalf, 1919). 
Ihlea punctata Ihle, 1935: 527-529. 
Ihlea asymmetrica Ihle, 1935: 527-529; Toki- 
oka, 1937: 222; Berrill, 1950: 300. 
SOLITARY form: Eight specimens examined, 
with length range of 3 (embryo)-l4 mm. 
(Fig. 10^). Test: No specimen of the solitary 
and aggregate generations except the embryo 
had the test attached. It is probably loosely 
attached to the adult. The test of the embryo 
is flabby, rather thick around gut and elaeo- 
blast area; without distinct elevations or de- 
Fig. 10. Ihlea punctata, a. Solitary form, left side, 
slightly dorsal; b, aggregate form, dorsal aspect; c, ag- 
gregate form, ventral aspect. 
