24 
Journal of the 
Sertularella. Gray. 
The Sertularellce described below are all small, simple species, 
with three marginal teeth to the hydrotheca, in which latter 
characteristic they resemble our other species, S. Johnstoni , 
S. neglecta , &c. I have found only one four-toothed species, which 
seems identical with S. simplex , Hutton, a native of New Zealand. 
S. LASVis. n. sp. Plate XII, fig. 6. 
Shoots simple, twisted at the base, about one-third of an inch 
in height, divided by narrow twisted joints into intemodes, each 
bearing a hydrotheca on its upper part. Hydrothecse divergent, 
long, smooth, slightly narrowed towards the aperture, each 
forming, with its internode, a sub-fusiform body ; aperture with 
three marginal teeth, one superior and two lateral. 
Gonothecae about twice as long as the hydro thecae, borne on the 
stem or on the hydrorhiza, ovate, with a few large, tranverse 
rugae, and a short, tubular neck, with three teeth on the summit. 
Almost colourless. Hah. Williamstown. 
S. indivisa. n. sp. Plate XII, fig. 7. 
Hydrorhiza slender, shoots simple, twisted at the base, about 
one-third of an inch in height, divided by narrow twisted joints 
into internodes, each bearing a hydrotheca on its upper part. 
Hydrothecae divergent, with two or three faint transverse ruga?, 
sometimes nearly smooth ; narrowed upwards and contracted near 
the aperture, which is furnished with three marginal teeth, one 
superior and two lateral; also with three internal, compressed, 
vertical teeth, alternate with the marginal ones. 
Gonothecae three to four times the length of the hydrotheca?, 
borne on the hydrorhiza or near the base of the hydrocaulus, 
usually not more than one on a stem • ovate, with distinct, not 
close, transverse ruga?, and a tubular neck; summit with from 
three to six teeth (generally four). 
Colour, yellowish-brown. Hab . Williamstown; St. Hilda. 
S, solidula. n. sp. Plate XII, fig. 8. 
Hydrorhiza matted, sometimes so closely as to form a con¬ 
tinuous expansion in parts ; shoots simple, about half an inch in 
height, twisted at the base, and divided by slightly-twisted joints 
