312 THE AMERICAN NATURALIST. [VorL. XXXV. 
Gonosome: Meduse borne on hydranth body above the whorl of 
proximal tentacles. Medusa liberated during early evening and dis- 
charging the sex products immediately thereafter. In many cases the ova 
are discharged before the liberation 
yy of the medusz, as indeed are also 
ms 
y Habitat: Abundant on piles of 
i docks, floating timber, eelgrass, fucus, 
| etc, usually in shallower waters. 
| x Development from June to October. 
Z 8. CORYMORPHID/. 
occasionally found definite colonial 
EC. E. 
i » Eg 
3 i amr ie 
Fic. 8. Fic. 9. 
i 
| " y Usually solitary, though I have 
í 
) 
j 
Fic. 8. — Pennaria tiarella McCr. 
Fic. 9. Hyd th 1 A h 1 
f medusaz 
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. i 
Corymorpha pendula Ag. 
(Cont. Nat. Hist. U. S., vol. iv.) 
Trophosome: Hydrocaulus from two to four inches in height, the fleshy 
Ceenosare 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. 
