42 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



Halecium fasciculatum,new species 

 Plate 10, Fig. 45 



Trophosome. — Colony 30 mm. ; main stem and larger branches fasci- 

 cled for some distance; branches few and irregularly placed; simple 

 portion of stem and branches strongly geniculate. Each internode seems 

 to terminate in a hydrophore, which is often reduplicated; the suc- 

 ceeding internode is given off near the distal end, and it, in turn, ends 

 in a hydrophore; this is continued throughout the whole length. There 

 are two annulations at the proximal end of each internode. The rim of 

 the hydrophore is distinctly flaring. Several of the hydrophore pedicels 

 have a large circular opening just proximal to the hydrophore. 



Gonosome. — Gonangium arising by a short, stout pedicel, from the 

 hydrophore pedicel, is broadly lenticular. Each side of the lens is strongly 

 marked by 5 longitudinal corrugations. (The contents of the gonangia 

 were not in good enough condition to determine the sex.) 



Distribution. — Between Charles and Indefatigable islands, 60 fath- 

 oms. 



Halecium flabellatum Fraser 



Halecium flabellatum Eraser, Some Japanese Hyd., 1935, p. 108. 



Distribution. — Tangola-Tangola, 15-20 fathoms. 

 These specimens agree entirely with the specimens from Japan ex- 

 cept that the gonangia are devoid of terminal nodules. 



Halecium gracile Verrill 



Halecium gracile Verrill^ Invert. An. Vineyard Sound, 1874, p. 729. 

 Nutting, Hyd. Woods Hole, 1901, p. 358. 



Distribution. — Bahia Honda, low tide; South Viradores Islands, 8- 

 10 fathoms; off White Friars, 25 fathoms, and in 5-10 fathoms. 



Halecium halecinum (Linn.) 



Sertularia halecina Linnaeus, Syst. Nat., 1767, p. 1308. 



Halecium halecinum Eraser, Hyd. of Vancouver Island, 1914, p. 165. 



Distribution. — San Francisco Bay, 3-8 fathoms; Tangola-Tangola, 

 15-20 fathoms; Isabel Island, 10-25 fathoms. 



