56 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



proximal or upper side seems to collapse readily so that many of the 

 hydrothecae have an appearance similar to that of a Diphasia hydro- 

 theca. 



Gonosome. — Not observed. 



Distribution. — Santa Elena Bay, 10 fathoms; San Francisco Bay, 

 2 fathoms; Gorgona Island, 5-6 fathoms; east of islands off Navidad 

 Head, 25-35 fathoms; South Bay, Cerros Island, low tide. 



Thuiaria tubuliformis (Markt.) 



Dynamena tubuliformis Marktanner-Turneretscher, Hyd. des K. 



K. Natur. Hofmuseums, 1890, p. 238. 

 Thuiaria tubuliformis Nutting^ Am. Hyd., Part II, 1904, p. 70. 



Distribution. — North shore of ^Venman Island, low tide; Albe- 

 marle Point, low tide; Banks Bay, low tide; Narborough Lagoon, low 

 tide; reef north of entrance to Tagus Cove, low tide; South Seymour 

 Island, low tide; Sulivan Bay, low tide; Cartago Bay, low tide; Santa 

 Elena Bay, 10-12 fathoms; Gorgona Island, low tide; Port Utria, low 

 tide; Jicarita Island, low tide; Bahia Honda, low tide; Tangola-Tan- 

 gola, low tide. 



Family Plumularidae 



Genus AGLAOPHENIA 



Aglaophenia diegensis Torrey 



Aglaophenia dicgcnsis Torrey^ Hyd. of the Pac. Coast, 1902, p. 71. 



Fraser, West Coast Hyd., 1911, p. 71. 



Distribution. — North shore of Wenman Island, low tide; Tagus 

 Cove, 30 fathoms; reef north of entrance to Tagus Cove, low tide; 

 Santa Maria Bay, low tide; South Bay, Cerros Island, 10-15 fathoms. 



Aglaophenia inconspicua Torrey 



Aglaophenia inconspicua Torrey^ Hyd. of Pac. Coast, 1902, p. 71. 



Distribution. — Near Christopher Point, Albemarle Island, low tide; 

 Black Beach, low tide; Santa Maria Bay, 35-40 fathoms. 



