384 THE AMERICAN NATURALIST. [VOL. XXXV. 
3, C. volubiiis Linn. 
Trophosome: Stems usually simple, long and somewhat twisted. Hydro- 
thecae deep and sub-tubular, margins with shallow undulations. 
Gonosome: Gonangia flask-shaped, smooth, with an elongate neck 
borne on short pedicels. 
Habitat: Frequently found growing upon other hydroids, usually in 
deep water. Gulf of St. Lawrence, Massachusetts coast, etc. 
4, C. neglecta Alder. 
Trophosome : Stems regularly branched, delicate, filiform, branches pin- 
nate, both stem and branches more or less annulated. Hydrothecz narrow, 
deep, borne on annulated pedicels and with marginal teeth bimucronate. 
Gonosome : Gonangia axillary or on short pedicels which are annulated, 
pear-shaped. 
The colony is very minute and inconspicuous. 
5, C. verticillata Linn. 
Trophosome: Colony composed of erect, fascicled stems, irregularly 
branched. Hydrotheca bell-shaped, rather large, deep, with from ten to 
twelve teeth about the margins, 
MM borne on annulated pedicels. 
EE Gonosome: Gonangia flask- 
£<-< shaped, smooth, borne on_ short 
pedicels and terminating in narrow 
orifice. 
6, C. amphora Ag. (FIG. 19). 
Trophosome : Colony resembling 
in general aspects that of Odelia 
commisuralis, attaining in some 
cases a height of four to six inches. 
Hydrothece campanulate, with en- 
tire margins, borne on annulated 
pedicels. 
Gonosome: Female gonangia elon- 
gate, somewhat obconical, borne on 
short annulated pedicels and opening 
by a terminal aperture. Male gonan- 
gia elongate, oval or spindle-shaped. 
Medusoids more or less degenerate, 
never becoming free ; the male, ac- 
cording to Agassiz, attaining a higher stage of development than the female. 
The embryo escapes from the gonangium as a free-swimming planula. 
Fic. 19. — Campanularia amphora Ag. 
(After Agassiz.) 
