308 
PACIFIC SCIENCE, VoL VIII, July, 1954 
[non] Salpa amhoinensis Apstein, 1906^/ 250; 
1906^ (soL): 166. 
SOLITARY FORM: Over 10 specimens exam- 
ined with length range of 3 (embryos)-29 
mm. (Fig. 18^). Test: Flabby, thin, especially 
over muscles; a rather thick, elongate gut 
swelling; there may be an additional swelling 
immediately over gut; no other permanent 
elevations or depressions. Muscles: Number 
of body muscles varies from 10 to 13, usually 
11 or 12; number of muscles may be different 
on opposite sides of the body; M I-III touch- 
ing dorsally as do X-XI and x; third upper 
lip sphincter muscle (B2) distinct, large, con- 
tinuous dorsally and ventrally; bow muscle 
interrupted dorsally, continuous ventrally; M 
I-III or IV forming rings; remainder of body 
muscles interrupted ventrally, becoming more 
widely interrupted posteriorly; all body mus- 
cles except I, II, X, and XI are joined dorsally 
by connecting bands of muscle; muscles rel- 
atively opaque and rather iridescent in all 
specimens examined. Ciliated groove: Simple, 
forming a crescent similar to that of 5. fusi- 
formis sol. Viscera: Gut rather compact, in 
condition A (Ihle and Ihle-Landenberg, 1933) ; 
stolon segmented only far anterior to gut, 
turning posteriorly at region of M V; a round 
or bean-shaped blood-forming organ present 
on left side of gut. 
AGGREGATE FORM: Six Specimens examined 
with a length range of 6-10 mm. (with pro- 
jections) (Fig. l^b,c). Test: Flabby, glutinous; 
thin over whole body, slightly thicker over 
gut forming a rounded bulge; a general swell- 
ing of test material in gut area; end projec- 
tions asymmetric, posterior one long, club- 
shaped, anterior one short, blunt. Muscles: 
Six body muscles of which M I-II and III-IV 
join dorsally into a group as do M V-VI; 
M I-II widely fused dorsally; all extend far 
toward the endostyle ventrally; a large, rather 
prominent independent muscle {in) on the 
posterior end projection under gut swelling, 
on right or left side according to position of 
animal on the stolon; this muscle much long- 
er and more prominent than in any species 
of Salpa; M Ai continuous dorsally; three 
ventral lip sphincters present. Ciliated groove: 
Situated vertically or almost so, a simple open 
structure. Viscera: Gut compact, in state D of 
Ihle and Ihle-Landenberg (1933); ribs or seg- 
ments of gill bar relatively far separated; 
embryo attached beneath M V on right dorsal 
body wall. 
Ritteriella picteti (Apstein) 1904 
Fig. I9a-f 
Salpa picteti Apstein, 1904: 655; 1906^.* 252; 
I906A 168; Ihle, I9IO: 43; 1912: 46. 
Cyclosalpa retracta Ritter, I906: 1. 
Salpa amhoinensis Apstein 1906^.' 250; I9O6A' 
166. 
[non] Salpa amhoinensis Apstein, 1904: 651. 
Salpa retracta Ihle, I9IO: 40; 1912: 45. 
Salpa {Ritteria) retracta Metcalf, I9I8: 53. 
Salpa {Ritteria) picteti Metcalf, 1918:55; Sewell, 
1926: 86. 
Salpa {Ritteriella) picteti Ys^omTi, 1932: 65. 
Ritteriella picteti WAt, 1935: 527-529; Tokioka, 
1937: 222; Thompson, 1948: 124; Berner, 
1954. 
SOLITARY form: Over 10 specimens exam- 
ined with length range of 21-86 mm. (Fig. 
19^,^). Test: Moderately thick over whole 
body with a slight elevation over the gut 
region; flabby and glutinous; no permanent 
elevations and depressions except over gut 
(Figure 19<^ represents an unusual condition 
in which there is present one lateral depression 
on each side; usually there is a single dorsal 
depression and no lateral ones). Num- 
ber varying from 13 to 24, including x and y, 
in the POFI specimens; number of muscles 
on one side usually different from number on 
opposite side; all body muscles continuous 
dorsally, interrupted ventrally; M I-V or VI 
usually connected by bands of muscle, re- 
mainder may be connected or distinct. Ciliated 
groove: Elongate, sinuous, but simple. Viscera: 
Gut in condition G (Ihle and Ihle-Landen- 
berg, 1933), T-shaped with esophagus and 
