HYDROIDS OF THE WOODS HOLE REGION. 
367 
Gonosome. — Gonangia subcylindrical, somewhat swollen below, not curved, borne usually at the 
origin and forkings of the hydrocladia. 
Distribution. — Eastport, Me. (Verrill). It is altogether probable that it occurs in the deeper 
water in the Woods Hole region. I have included it here to enable collectors to identify it if found. 
ANTENNULARIA. 
Trophosome. — Hyrocladia arranged in verticels or whorls around stem. Stem with canaliculated 
ccenosarc, the canals being just under the periderm and not well seen except with transmitted light. 
Gonosome. — Gonangia borne usually in the axils of the hydrocladia, not protected by gonangia or 
other special contrivances. 
71. Antennularia ntgosa Nutting. 74 A. Part of hydrocladium (enlarged). 
Key to species of Antennularia found in the Woods Hole region. 
A. A node between the first hydrotheca on each hydrocladium and the stem from which it springs A. antennina. 
A'. No node between the first hydrotheca and stem. 
a. At least two nodes between adjacent hydrothecae a. americana. 
a 1 . Hydrocladial nodes distant and usually absent , y £_ rugosa. 
Antennularia antennina (Linn.) Fig. 72. 
(Sertularia antennina Linn., Syst. Nat., 1310.) 
Trophosome. — Colony composed of a cluster of upright stems with whorls of hydrocladia at 
regular intervals; hydrocladia borne on stout processes from the stem, the first internode being without 
