CALKINS: SOME HYDROIDS FROM PUGET SOUND. 
351 
branched, given off at intervals from a creeping stolon, 8-10 rings 
at the base and 3-8 rings above origin of branches. As in C. 
attenuata the branches run almost parallel with the main stem but 
not so noticeably as in that species. The hydrothecae are long, 
large, and deeply campanulate. The margin has from 10-11 large 
teeth. The walls of the cup are so delicate that perfect specimens 
are rare. 
Gonosome. Gonothecae arise on short, ringed stems immediately 
above or in the axils. They are slightly longer and more slender 
than the hydrothecae and are deeply wrinkled. Medusae-buds 2-5, 
and 3-4 are usually enough developed to show the manubrium and 
tentacles. 
Diaphragm slender and delicate, forming an indefinite tube 
around the coenosarc. The basal chamber forms a part- of the 
stem cavity. 
Dimensions. Height of colony, 4-12 mm.; length of hydrotheca, 
.75 mm.-l mm.; width of hydrotheca at top, .5 mm.; width of 
hydrotheca at bottom, .1 mm.; length of gonotheca, 1.3 mm.; 
width at top, .25 mm.; width at bottom, .15 mm.; number of 
tentacles on hydranth, 18. 
Habitat. On red algae at Port Townsend; tests of ascidians, 
sponges, etc. (Brady); Bergen, on Laminaria (Sars). 
11. Campanularia caliculata Hincks. PI. 2, figs. 11, 11 a, 
lli?, 11c. PI. 0, fig. Ho. 
Trophosome. Stem simple, of variable length, with one well- 
marked ring immediately behind the hydrotheca ; occasionally one' 
or more irregular segments below the ring,— while from here down* 
the stem is perfectly smooth. The base is much branched, forming 
a complicated meshwork of stems on the red algae to which it is. 
attached. Walls of calycles greatly thickened, the thickening 
projecting inwards at base to form the diaphragm on which the 
hydranth rests; with clean even ring. Tentacles very numerous 
(22-28) and small. 
Gonosome. Gonotheca with a short stalk, truncate at the end,, 
and with a decidedly flattened form, wide aperture, and perfectly 
smooth walls. The capsule contains two sporosacs, a large one 
above and a smaller (very much smaller) one below. Four 
branched ^astro-vascular canals arise from the base. 
The diaphragm is formed solely by the ingrowth of the thick 
walls of the calycle. The coenosarc is not constricted by the dia- 
