HYDROIDS OF EASTERN CANADA 



165 



Ilalecium. ndnutum Brocli. 



Tropliosome. Stem s'lnple. slender, irregularly 

 branched, wavy or annulated throuji-hout ; liydrophoves 

 with flaring margin, often much reduplicated, 



GonoKonip. Gonangia very large, '^> mm. in dia- 

 meter, cockle-shaped, with the mai-gin wavy below and 

 spinj'^ above. 



No. 64. 

 II alecium minutuin. 



Haleciiun muricatum (Ellis and Solander). 



Tropliosome. Stem fascicled, stout, rigid, irregu- 

 larly and densely branched ; primary branches fascicled ; 

 ultimate branches and pedicels pinnately arranged; 

 hydrophores witli margin flaring. 



Gonosome. Gonangia crowded on the branches, 

 ovate, much greater in the one diameter than the other ; 

 numerous prickles on tlie surface, arranged in raised 

 rows. 



No. 65. 

 Halecium muricatum. 



Hcdecium sessile (Hincks). 



Tropliosome. "Stem slender, irregularly branched, 

 branches not in the same plane; branches .iointed, the 

 'joints consisting of a Siingle strictv;re; hydrothecse alter- 

 nate, very short, and perfectly sessile, not rising at all 

 separately from the lateral stem processes of which 

 they are mere openings, \\'ithout being raised into a 

 tube" (Hincks). 



Gonosome. Unknown, 



No. 66. 

 Ilalecium sessile (after Hincks ■ 



Halecium tenellum Hincks. 



Tropliosome. Colony small, 15 mm. high; stem 

 delicate, annulated or wavy, irregularly branches, 

 sometimes dichotomously ; margin of hydrophore 

 strongly flaring. 



Gonosome. Goixangia oval or ovate, broader in 

 one diameter than in the other, smooth, axillary or on 

 the branch below the hydrophore. 



No. 67. 



Halcchim tenellum. 



