'354 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
as well as the primary stem have four or more annulations at the 
base and are occasionally provided with tendril-like processes. 
Hydrothecae placed regularly and alternately at the angles formed 
by the very slight zigzag of the main axis. Usually there are two 
hydrothecae at each anode, but in the older anodes one of these is 
borne on a comparatively long stalk having four annulations at the 
base and three below the hydrotheca. The other hydrotheca is on 
a stalk borne in the axil of the former. While the stalk in the latter 
>• 
case is much shorter than that of the former, the cup on the other 
hand, and with it the hydranth, is perceptibly larger. The differ¬ 
ence is so constant and so noticeable that it can be measured. The 
smaller hydrotliecae, i. e., those on the longer stalks, are on the 
average .32 mm. long and .19 mm. wide, while the larger or axillary 
hydrothecae are .36 mm. long and .32 mm. wide. Not only is there 
a difference in size, but the shape, as shown by the dimensions, 
differs as well. All hydrothecae have plain margins. Hydranths 
with about 28 tentacles. 
Diaphragm. The diaphragm is distinctly double, consisting of a 
lower portion with a tendency to follow the coenosarc down into 
the stem, and an upper shelf-like part which supports the hydranth. 
The basal chamber forms part of the stalk cavity. (PI. 6, fig. 13 d.) 
Gonosome. The sconothecae are borne in the axils of the 
lower hydranth and correspond in position to the long-stalked 
hydranth higher up. They are distinctly club shaped, enlarging 
gradually from the base to the extremity, which is surmounted by a 
well-defined collar, and they are slightly wrinkled. Medusae-buds 
spring from all sides of the blastost.yle. The older ones are Hat 
with about 28 closely pressed tentacles, and with a four-cornered 
mouth. 
Dimensions. Height of hydrocaulus, 6—20 mm.; length of 
larger hydrotheca, .36 mm.; length of smaller hydrotlieca, .325 mm.; 
width at margin of larger hydrotheca, .34 mm.; width at margin of 
smaller hydrotheca, .19 mm.; length of gonotheca, .750 mm.; diam¬ 
eter at extremity, .26 mm. 
Habitat. On grasses at Scow Bay, Port Townsend Harbor. 
Co 1 
The present species agrees with Campanidaria coruscans Schnei¬ 
der in dimensions but differs in other respects. The trophosome 
resembles that of Agassiz’s Eucope diaphana except that the hydro¬ 
theca-stalk is ringed throughout in the latter ; the gonosome on the 
other hand differs completely. 
