162 THE ROYAI. SOCIETY OF CANADA 



with opening at the distal end. They are found scattered over the 

 colony. The wall is covered with a chitinous network, formed by 

 shoots from the branches. Levinsen says they are formed like a 

 long sack, growing to the branches for a greater part of their length. 

 Broch says that in the creeping colonies, the gonangia can be dis- 

 tinguished from the hydrothecse only by their shorter pedicels, while 

 in the erect colonies, the gonangia are greatly elongated, oviform, 

 fixed to the stem by the tapering extremity. Judging from Levinsen's 

 small scale drawing, the oval gonangium is about three times the 

 length of the hydrotheca. 



Distribution. — Off Lasqueti I., West Rocks, north of Gabriola I,, 

 Cabriola Reefs. 



Family Halecidae 



Trophosome. — Hydrothecae reduced to saucer-shaped hydro- 

 phores, which usually pass without constriction into the broad, 

 tubular pedicels; they are too small to lodge the contracted hydranth; 

 margin entire, often flaring; reduplication common; hydrophore 

 with a circle of bright dots just below the rim; hydranths with conical 

 proboscis. 



Gonosome. — Gonophores producing fixed sporosacs. 



Key to the genera of Halecidse found in the Vancouver I. region. 



A. Tentacular organs absent Haled uni 



B. Tentacular organs present Ophiodes 



Genus HALEGIUM 



Trophosome. — As in the family; no tentacular organs present. 

 Gonosome. — Gonangia usually different in the two sexes. 



Key to the species of Halcciiim found in the Vancouver I. region. 



A. Stem simple 



a. Strongly annulated 



1. Stem erect 77. annulât uni 



2. Stem creeping 77. corrugatum 



b. Not strongly annulated 



1. Stem stout, wall of hydrotheca stout II. kofoidi 



2. Stem very slender, often wavy II. tenellum 



3. Colony low, without continuous stem H.,pygmœum 



B. Stem fascicled 



a. Hydrophores sessile, borne directly on broadened shoulders 

 of internodes of the stem. 



