260 University of Californa Publications. | ZooLocy 
This species first figured and described by Trask (757) from 
San Francisco Bay is probably the S. brevisetis, Hincks (’82) 
from Queen Charlotte Islands, of which only a short description 
without figure is given. Trask found neither vibracula nor 
vibracular chambers, but they are abundant, as I have observed, 
on the lower part of the colony, while almost entirely lacking on 
the upper portion. 
S. californica is distributed at various points along the coast 
of California; it grows luxuriantly at Dillons Beach and at 
many places on San Francisco Bay, and occurs in small quantity 
below Point Concepcion. 
12. Serupocellaria varians Hincks. 
Pl VOW, fies: 38,39- Blo XV1, fig. 95: 
Scrupocellaria varians Hincks, 1882, p. 461, Pl. XTX, figs. 1-le. 
Zoarium forming bushy tufts 12-25 mm. in height. (PI. 
XVI, fig. 95.) Branching dichotorhous, internodes consist- 
ing of a variable number of zocecia, those in the lower part of 
the colony containing usually five or seven zoccia, those at a 
higher level, nine or eleven. Joints yellow. Zowcia biserial, 
alternate, slightly narrower below; aperture oval, occupying 
more than half the front; scutwm sometimes a mere spine, some- 
times bifid or trifid, usually inclined downward (Pl. VIII, fig. 
38) ; two spines on the upper margin, one of them just above the 
seutum, the other opposite. Both lateral and frontal avicularia 
developed on each zocecium. Lateral avicularia of different pro- 
portions, the greater number being much elongated, extending 
upward and outward, with a long, thin, pointed, curved beak 
(c. av.) ; frontal avicularia just below or slightly to one side of 
the aperture; sessile, raised, with mandible directed transversely. 
Vibracular chamber triangular, the apex visible from the front 
(fig. 39, v. ch.) ; vibraculum (v.) longer than a zocecium, and 
the groove into which it falls, extending transversely across the 
zocecium (gr.). Owcia (fig. 38, oe.), smooth, developed on each 
zocecium of the terminal internodes. Rootlets springing from the 
base of the vibracular chamber (fig. 39, 7.). 
