70 University of California Publications. | ZOOLOGY 
stein’s suggestion that we have here a variety that pertains to 
the solitary generation alone is interesting, but can hardly be 
regarded as of much value until established by direct evidence. 
This form has been taken several times at various places on 
the California coast during the last ten or twelve years. It 
would seem to be coincident with the typical fusiformis-runci- 
nata in distribution. 
Salpa tilesii-costata (Cuvier-Quoy et Gaim.). 
Salpa tilesii Cuvier, 1804, p. 375, figs. 3-6. 
Salpa costata Quoy et Gaim, 1834, Zool. t. 3, p. 587, Pl. 86, 
figs. 1-5. 
Salpa costata-tilesii Krohn, 1846, p. 114. 
Salpa costata-tilesii Traustedt, 1885, p. 379, Pl. 1, figs. 10 and 11; 
and Pl. Il. figs. 38-41, and 47. 
Salpa costata-tilesii Herdman, 1888, p. 60, Pl. 4, figs. 1. 4, 8. 
Salpa costata Brooks. 1893, p. 10 (particularly), Pl. IV, fig. 4; 
Pl. VIII, fig. 4, 
Salpa Tilesii Apstein, 1894, p. 16; 1901, p. 111 10, figs. lla, 11b. 
* 
\ ; Fi f | | eee hie AVP D> 2 
= held Les ee ars 
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f 
ooernad | 
Fig. 16.—S. tilesii-costata, solitary generation. 
(a) Solitary (budding) generation.—Fig. 16. Body much 
larger anteriorly, tapering gradually back to the region of the 
nucleus, then expanding again rather abruptly to the atrial ter- 
mination. A prominent hump on the ventral side corresponding 
to the nucleus. Anterior end rounded: posterior truncate but 
for slight lateral notches, and armed with a pair of firm com- 
pressed, green edged appendages arising laterally from a little 
in front of the edge of the atrial orifice. Both orifices distinctly 
terminal. Lips of branchial orifice prominent, the ventral some- 
what more so, upper finely serrated on its inner edge. Length 
of longest specimen, 19 em., exclusive of appendages, which were 
47 mm. Test thick and firm, particularly on the ventral side, 
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