28 University of California Publications. | ZOOLOGY 
28. Sertularella tenella Alder. 
Sertularia tenella, Alder, 1856, p. 357, pl. 138, figs. 3-6. 
Sertularella tenella, Alder, 1857, p. 113. 
Serularella tenella, Hincks, 1868, p. 242, pl. 47, fig. 3. 
Sertularella tenella, Hartlaub, 1901, p. 360, pl. 21, figs. 12, 20, 21. 
Sertularella tenella, Torrey, 1902, p. 64. 
Trophosome. ‘‘Zoophyte minute; stems short, slender, simple or 
slightly branched, zigzagged and jointed and twisted above each calycle; 
hydrothecae rather distant, elongate, barrel shaped, finely ribbed across, 
the aperture erect, patent, squared, 4-toothed, and closed by a four sided 
operculum, ’” 
Gonosome. ‘‘Gonothecae ovate, slender, ringed transversely, produced 
above into a short, tubular orifice’’ (Hincks). 
Distribution. a Jolla, Cal., between tides; San Diego, 9 
fathoms. Bare I. (Hartlaub). Gt. Britain, between tides to 
deep water (Hincks). New Zealand (Hartlaub). 
Growing on rocks and Fucus. No gonosome, July 16, 1901, 
July 138, 1903. Longest stem, 4 mm.; length of hydrotheca, .4 to 
.) mm., breadth, .25 mm. 
29. Sertularella tricuspidata (Alder). 
Sertularia tricuspidata, Aider, 1856, p. 356, pl. 13, figs, 1, 2. 
Sertularella tricuspidata, Hincks, 1868, p. 239, pl. 47, fig. 1. 
Sertularella tricuspidata, Clark, 1876, p. 224, pl. 12, figs. 26, 27. 
Sertularella tricuspidata, Nutting, 1899, p. 741. 
Sertularella tricuspidata, Hartlaub, 1901, p. 359. 
Sertularella tricuspidata, Nutting, 1901, p. 183. 
Sertularella hesperia, Torrey, 1902, p. 63, pl. 7, figs. 57, 58. 
Trophosome. ‘‘Colony a matted mass of shoots and twigs some- 
times attaining a height of 5 or 6 inches. Stem not fascicled, slender, 
divided into internodes, each of which bears a hydrotheca or a branch with 
its axillary hydrotheea. Branches irregularly alternate, often branching 
profusely either alternately or dichotomously, divided into regular inter- 
nodes each of which bears a hydrotheea, some of the nodes being double 
and oblique, which gives a twisted appearance to the branch. Hydro- 
thecae distant, small, cylindrical, without corrugations, the distal half 
or more being free; margin with three strong, equal and equidistant teeth.’’ 
Gonosome. ‘*Gonangia borne profusely on the main stem and 
branches, large, oblong-ovate, marked throughout with very prominent 
compressed annular ridges, the uppermost of which forms a bowl-shaped 
structure from the center of which arises the tubular neck which ends in 
a slightly everted margin and round aperture.’’ 
Distribution. San Diego Bay, 1 to 9 fathoms. ‘‘ Abundant 
throughout the north polar and north temperate regions of the 
world’’ (Nutting, :04). 
