HYDKOID3 OF THK WOODS HOLE KEOION. 



367 



i'. Gonangia subcylindrical, somewhat swollen below, not cun'ed, borne usually at the 

 origin and Workings of the hydrocladia. 



fHntriliiitinn. 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. 



Tmjiltosome. Hyrocladia arranged in verticals or whorls around stem. Stem with canaliculated 

 ecenosare, the canals being just under peridenn and not well seen except with transmitted light. 



(jiiiio&ime. Gonangia borne usually in the axils of the hydrodadia, not protected by gonangia or 

 other special contrivances. 



73. AiiteiiniilnriaamcricunaHutting. 73 A. Part of hydrocladium (enlarged). 



- 



74 A. 



73 A. 



1 

 'rr j 



74. Aiilrnnnlaria riiijnmi Xmtiiijf. 71 A. Part of hydroeladium (enlarged;. 



Key to species of Anlenmtlaria fuuml 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. 



o. At least two nodes between adjacent hydrothecte A. americana. 



a'. Hydrocladial nodes distant and usually absent , A.rugota. 



' 



Antennularia antennina (Linn.) Fig. 72. 



_ ___ (fierlularia antennina Linn., Syst. Nat., 1310.) 



Troplwsome. 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 



