Pacific Salpidae — YoUNT 
301 
of Salpa fusiformis and S. maxima are in some 
specimens almost identical. Figure 13/ shows a 
specimen of S. viaxima of this type. Muscles: 
Eight body muscles, usually far separated from 
one another, but groups may be formed; ex- 
tending only a short distance ventrally; at- 
tachment organ on each side dorsally between 
M VI and VII that may be prominent, re- 
duced, or absent (Fig. Ciliated groove 
(Fig. 13g,/?): Forms a large incomplete loop 
with three bends; in larger specimens, minor 
bends give the appearance of segmentation. 
Viscera: Gut compact, in condition F (Ihle 
and Ihle-Landenberg, 1933); stolon extending 
Fig. 13. Salpa maxima, solitary form, a. Smaller specimen, right side (the gut has been drawn up to reveal 
test cavities); b, dorsal attachment organ of a specimen similar to a, lateral aspect; c, same specimen as a, schematic 
cross section of test at level of M III; d, same specimen as a, schematic cross section of test at gut level; e, larger 
specimen, left side; /, same specimen as e, lateral aspect of dorsal attachment organ; g, same specimen as e, lateral 
aspect of ciliated groove and associated structures; h, same specimen as a, ciliated groove, ganglion and eye, 
•dorsolateral aspect; i, echinate form, ventral aspect of test; j, same specimen as /, test from left; k, same specimen 
as /, schematic cross section of test at level of M III; /, another echinate specimen, dorsal aspect; m, same specimen 
as /, schematic cross section of test at gut level. 
