312 THE AMERICAN NATURALIST. [VoOL. XXXV. 
Gonosome: Meduse borne on hydranth body above the whorl of 
proximal tentacles. Medusz liberated during early evening and dis- 
charging the sex products immediately thereafter. In many cases the ova 
are discharged before the liberation 
of, of the medusz, as indeed are also 
Nall the sperms. 
if Habitat: Abundant on piles of 
docks, floating timber, eelgrass, fucus, 
' etc., usually in shallower waters. 
i +, Y Development from June to October. 
\ if Rey 8. CORYMORPHID. 
, NY if . 
ee | ares Usually solitary, though I have 
Rey, | occasionally found definite colonial 
> NS 
e. \V tvZ 
Oo ea. ( 
4&8 | mo \\ 
iy 4 f 
\¥ ‘ 
ae . = 
= saa =——— 
Fic. 8. FIG. 9. 
Fic. 8.— Pennaria tiarella McCr. 
Fic. 9.— Hydranth enlarged, showing origin of medusz. 
buds arising direct from the hydrorhiza. Hydranths with proximal and 
distal whorls of filiform tentacles. Gonophores as free medusz with four 
radial canals and with one to four marginal tentacles, one of which is usually 
much the larger. 
Corymorpha pendula Ag. 
(Cont. Nat. Hist. U.S., vol. iv.) 
Trophosome: Hydrocaulus from two to four inches in height, the fleshy 
coenosarc traversed by longitudinal canals which ramify more or less near 
the base. Hydrorhiza an indefinite root-like expansion of the base, by 
which the whole is attached to the sandy substratum. 
Hydranths flask-shaped, sharply distinct from stem. Proximal tentacles 
large, forming a single whorl at base of hydranth. Distal tentacles very 
contractile, forming alternating verticils about the base of the hypostome. 
