44 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



Distribution. — Jicaron Island, 15 fathoms; north of White Friars, 

 5-10 fathoms; east of islands off Navidad Head, 25-35 fathoms. 



The colony bears some resemblance to H. articulosum Clark but is 

 a much smaller species. 



Halecium tenellum Hincks 



Halecium tenellum Hincks, Ann. and Mag. Nat, Hist. (3), VHI, 



1861, p. 252. 

 Fraser, Hyd. of Vancouver Island, 1914, p. 169. 



Distribution. — North of Wenman Island, 100-150 fathoms; Black 

 Beach, at low tide; Post Office Bay, 12-15 fathoms; James Bay, 50-70 

 fathoms; Cartago Bay, 32 fathoms; between Charles and Indefatigable 

 islands, 60 fathoms; off Black Beach, 25-40 fathoms; Secas Islands, 25 

 fathoms; White Friars, 25 fathoms; east of islands off Navidad Head, 

 25-35 fathoms. 



Halecium tortum, new species 

 Plate 10, Fig. 48 



Trophosome. — (No complete colony obtained.) Main stem and 

 larger branches strongly fascicled; smaller branches simple, slender, 

 sometimes again branched. Each branch is more in the nature of hydro- 

 phore pedicels than a continuous series of internodes; each pedicel, ex- 

 cept the proximal, arises from the preceding one at a point just below 

 the hydrophore. The hydrophores are somewhat alternately arranged, 

 but as they are not all in the same plane they may have a decided spiral 

 twist; rim of hydrophore scarcely flaring. 



Gonosome. — Not observed. 



Distribution. — East of islands off Navidad Head, 25-35 fathoms. 



Halecium vagans, new species 

 Plate 10, Fig. 49 



Trophosome. — Slender, somewhat straggling colony, 13 mm. high, 

 branching irregular, with a tendency to dichotomy. Internodes of stem 

 long and slender, commonly with a double annulation at the node, the 

 sessile hydrophore being just below the annulation. Branches give off 

 immediately below the hydrophore, either singly or in pairs, to give the 



