62 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



are short with a well marked septal ridge; the hydrothecate are rela- 

 tively long, nearly equal in depth and breadth with the hydrotheca near 

 the distal end; there is a strong septal ridge near each end. There are 

 two supracalycine nematophores and one mesial one on each hydro- 

 thecate internode, none on the nonhj^drothecate. There is one cauline 

 nematophore on each internode, just distal to the hydrocladial process. 



Gonosome. — Not observed. 



Distribution. — Off Thurloe Point, 8-10 fathoms. 



Plumularia alicia Torrey 



Plumularia alicia Torrey^ Hyd. Pac. Coast, 1902, p. 75. 

 Torrey^ Hyd. San Diego, 1904, p. 37. 



Distribution. — South Bay, Cerros Island, low tide. 



Plumularia alternata Nutting 

 Plate 14, Fig. 71 



Plumularia alternata NuTTiNG, Am. Hyd., Part I, 1900, p. 62. 



Fraser, Beaufort Hyd., 1912, p. 381. 



Trophosome. — Colony simple, unbranched, 12 mm. Stem geniculate, 

 divided into internodes of which every alternate one bears a hydrotheca 

 and a hydrocladium. Hydrocladia divided into regular internodes, hydro- 

 thecate and nonhydrothecate alternating, the proximal one being non- 

 hydrothecate; hydrothecate internodes bounded by oblique nodes proxi- 

 mally and transverse nodes distally. Hydrotheca deeply campanulate, 

 with about one third of the distal portion free. Supracalycine nemato- 

 phores present, and mesial nematophores on both types of internodes. 

 There is one nematophore on each internode of the stem and one at 

 the axil of the hydrocladium. 



Gonosome. — (Not previously described.) Gonangia arise in verticils 

 of four just below the bases of the cauline hydrothecae, each gonangium 

 with a short pedicel, with two or three annulations. The gonangium is 

 the shape of a curved cornucopia, enlarging gradually to the distal end, 

 which is almost truncate. Each gonangium bears two nematophores. 

 The blastostyle follows the curve of the gonangium and had a definite 

 enlargement near its distal end. 



Distribution. — Braithwaite Bay, on coral at low tide; north of 

 Wenman Island, 100-150 fathoms,- and at low tide; Black Beach, low 



