348 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Campanularia. 
Hydro theca with smooth or toothed margin without operculum. 
Blastostyle producing medusae or sporophores — a number always 
developing at the same time. 
6. Campanularia johnstoni Alder. PI. 1, figs. 6, 6 a, 6b, 
6c. PI. 6, tig. 6 d. 
iSertularia v'olitbilis Ellis and Solander. Campanularia volu- 
bilis Johnston. Eucope campanulata Gegenbaur.. Clytea bicophora 
Agassiz. 
Stems long, transparent, simple or slightly branched, ringed at 
base and at top with the intermediate portion smooth. Hydrotheca 
deep and sharply toothed (10-15 teeth). Stem ringed at base 
and below cup. Gonotheca with short, ringed stalk coming from 
rhizome and with only one deep, constriction in place of the usual 
large number of annulations. Producing medusae (5 at one time), 
all from one side of. the blastostyle. Diaphragm a single piece 
which turns downward at the aperture to form a short tube 
through the basal chamber (PI. 6, fig. 6i>). 
Dimensions. Length of stem, 1J-2 mm.; length of cup, .65 mm.; 
length of gonotheca, 1 mm.; width at apex, .85 mm.; number of 
teeth on theca, 13-15; number of tentacles on hydranth, 21-22; 
number of tentacles on medusae, 4; number of annulations at base, 
8-10 ; number of annulations below cup, 2-5. 
I refer this species to C. johnstoni provisionally. There seem 
to be some differences from the form described by Hincks, Schneider, 
and others, especially in regard to the gonotheca, which in the 
European species is strongly ringed with 7 or 8 annulations, whereas 
in the present species, there are at most only two formed by a 
single constriction in the center. I hesitate to make it a new 
species on this difference and regard it as only one of the many 
variations for which the species is noted. It may be identical with 
Clarke’s Campanularia denticulata from Alaska. 
Habitat. Pound on algae at Port Townsend. Quite common 
and generally distributed. Previously reported from England 
(Hincks and others), Norway (Van Beneden), France (Lacaze- 
Puthiers), New England coast (Agassiz), Alaska (?) (Clarke), 
Bovigno (Schneider). 
