132 THE ROYAL SOCIETY OF CANADA 



C. Gonophores producing free medusae 



a. Medusas globular, with four tentacles at time of liberation 



Clytia 



b. Medusae flatter, with 16 or more tentacles at time of liberation 



Obelia 



There are few distinguishing differences in the trophosomes of 

 these genera. 



Genus CAMPANULARIA 



Trophosome. — As in the family. 



Gonosome. — Gonophores producing sporosacs from which planulae 

 develop within the gonangia. 



Key to the species of Campanularia found in the Vancouver I. 

 region. 



A. Stem fascicled 



a. Hydranth pedicels in a whorl C. verticillata 



b. Hydranth pedicels given off singly C. gelatinosa 



B. Stem branched but not fascicled C. exigua 



C. Stem unbranched or slightly branched 



a. Hydrotheca margin entire 



1. Hydrothecae very large C. regia 



2. Hydrothecae of smaller size with thin walls. . . . C. intégra 



3. Hydrothecae with thick walls, margin sometimes wavy 



C. everta 



b. Hydrothecal margin toothed 



1. Hydrothecae with vertical lines 



i. Lines very distinct throughout the whole length 



of the hydrotheca C. grœnlandica 



ii. Lines distinct towards margin only. . . C. speciosa 



2. Hydrothecae without vertical lines 



i. Each tooth in the margin with two cusps 



C. longitheca 



ii. Teeth 5 or 6 in number C. raridentata 



iii. Teeth blunt about 10 in number C. volubilis 



iv. Teeth blunt 12-18 in number C. urceolata 



v. Teeth deep, acute; hydrotheca tapering from 



margin to base C. denticulata 



vi. Teeth shallow, acute, hydrotheca suddenly nar- 

 rowing at base C. fusiformis 



Campanularia denticulata Clark 



PI. X, Fig. 25 

 Campanularia denticulata Clark, Alaskan Hydroids, 1876, p. 213. 

 Campanularia denticulata Fraser, West Coast Hydroids, 1911, p. 29. 



