48 C. McLEAN FRASER 



HALECIUM ORNATUM Nutting 



Halecium ornatum Nutting, Hydroids of the Harriman Ex. 1901, p. 181.. 

 Distribution. — Berg Inlet, Glacier Bay, Alaska (Nutting). 



HALECIUM PYGM^UM new species 

 PI. IV, Figs. 1-2 



Trophosome. — Colony minute, largest specimen reaching a. 

 height of 2.5 mm. The stolon, creeping on kelp, anastomoses to 

 such an extent that a dense net-work is produced. The stem most 

 commonly consists of but one pedicel about .5 mm. long, but may 

 consist of a series of these pedicels, each giving origin to another 

 pedicel just below its hydrophore. Not more than five were found 

 in any one series. In rare instances, branches consisting of one or 

 two of these pedicels, were also given off. The pedicels thus take 

 the place of stem joints bending alternately to one side and the 

 other, but as they are not all in the same plane, the trophosome 

 seems somewhat spirally twisted. The annulations are not very 

 well marked ; there may be one or two near the base of each pedi- 

 cel. The hydrophores are large with expanded margins, either 

 not everted or but slightly so. 



Gonosome. — Only the female gonosomes were found. In these 

 the gonangia are borne on short pedicels, attached immediately 

 below the hydrophore. In a case where a trophosome consists 

 of a single pedicel, the gonangium extends beyond and overtops 

 the hydrotheca. There is only one gonangium on each of the 

 stems, with one or more than one pedicel. The shape is obovate 

 with a projection on one side near the top immediately over the 

 opening which is shaped like a half -moon.. The ova are of large 

 size, six to eight in each gonangium. 



Distribution. — San Juan Archipelago in Prof. Kincaid's col- 

 lection. 



HALECIUM REVERSUM Nutting 

 Halecium reversum Nutting, Hydroids of the Harriman Ex., 1901, p. 180'. 

 Distribution. — Juneau, Alaska (Nutting). 



HALECIUM ROBUSTUM Nutting 

 Halecium rohusium Nutting, Hydroids of the Harriman Ex., 1901, p. ISB'. 

 Distribution. — Berg Inlet, Glacier Bay, Alaska (Nutting). 



