CALKINS: SOME HYDROIDS FROM PUGET SOUND. 
361 
Gonosome. Gonotheca large, conical, given off midway befcw r een 
two adjacent hydrothecae. Characterized chiefly by the presence 
of nodules on the distal half. These are arranged in three circles. 
The first circle is made by four nodules at the extremity. The 
second circle is about one quarter of the length of the gonotheca 
from the extremity, and consists of 6 nodules; the third row is 
about midway between the apex and the base and consists of eight 
nodules. The aperture is small. 
Dimensions. Height of colony, 25-50 mm.; distance between 
joints (length of internodes), .5 mm.; length of gonotheca, .58 mm.; 
greatest diameter, .35 mm.; length of gonotheca, 1.1 mm.; greatest 
diameter of gonotheca, .8 mm. 
Habitat. Dredged in 15-20 fathoms off Marrowstone, Town¬ 
send Harbor. Not common. It bears a slight resemblance to 
Heller’s S. crassicaulus. 
3. Thvjaria group. 
25. Thujaria thuiaroides. 
A small specimen of this hydroid was found among algae and 
not in very good condition. Gonothecae absent. 
Described also by Clarke from Alaska. 
26. Sertularia fabricii Levinsen. PI. 5, figs. 24, 24a, 24h. 
The shoots are bushy with a spiral arrangement of the branches. 
The latter turn upwards and give a characteristic spiral appearance. 
The branches are given off alternately about 1^ mm. apart, and they 
are branched and subbranched in turn to form fan-shaped offshoots. 
The hydrothecae are subalternate, narrowed towards the upper 
part which is free and divergent; from 5-7 to an internode; the 
latter are of different lengths. The aperture is small and oblique. 
Gonothecae (Hincks) broad at the top, attenuated downwards, with 
two spines above (or sometimes only one) and a slightly raised 
circular aperture. 
D intensions. Height of colony, 35 mm. 
Habitat. Dredged off Marrowstone, Townsend Bay, 15-18 
fathoms. Previously reported from England (ITincks and others); 
mouth of Elbe (Kirchenpauer); Greenland (Fabricius); North Cape 
(Sars); Southern Labrador (A. S. Packard, Jr.); Nova Scotia 
(Dawson); Grand Manan (Stimpson); Massachusetts (Agassiz); 
South Africa (Busk). 
