442 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



It is a conspicuous species because of its color, distributed around the 

 world in warmer waters; on the Pacific coast noted only by Hastings 

 at Gorgona, Colombia, and Mazatlan, Mexico. 



Hancock Stations: a common species dredged at 24 stations; from 

 San Benito Islands off the west coast of Lower California and Angel 

 de la Guardia Island in the Gulf of California, to the Galapagos Islands ; 

 including Clarion and Socorro Islands west of Mexico ; the coast of 

 Mexico; Cocos Island off Costa Rica; Secas Islands and Taboga Island, 

 Panama; Octavia Rocks, Colombia; and the Galapagos Islands. The 

 range is therefore from about 28'N southward to the equator, and from 

 the shoreline down to 125 fms. 



Adeona tubulifera Canu and Bassler, 1930 

 Plate 58, fig. 8 



Adeona tubulifera Canu and Bassler, 1930:34. 



This species differs from A. violacea (Johnston) in the larger size 

 (average 0.65 mm long by 0.45 mm wide), in the presence of a tall, 

 thick-walled peristome, and the location of the avicularium on the 

 proximal wall of the peristome instead of on the frontal. Our specimens 

 encrust coralline nodules and are coarser in appearance than violacea, 

 and I have never observed any pigmentation. The ascopore and the 

 aperture are similar to those of violacea, but the avicularium is much 

 more slender and is pointed upward on the peristome above its base. 



The gonozooecium has no peristome, is noticeably enlarged, and its 

 aperture measures 0.18 mm in width. 



Known only from the Galapagos Islands, "Albatross" stations 

 D.2813 and D.2815. 



Hancock Stations, 143-34, Wenman Island; 147-43 and 155-34, 

 Albemarle Island; 170-34, and 438, Chatham Island; 810-38, Barring- 

 ton Island: 409, James Island; 469, Charles Island: and 473, Hood 

 Island, all from the Galapagos. Also at 210-34, Santa Elena Bay, 

 Ecuador. The known range is very limited and near the equator, and 

 bathymetrically from 10 to more than 100 fms. 



Genus TRIGONOPORA Maplestone, 1902 



Metrarabdotos Canu, 1914. 



"The ovicell is endozooecial. The aperture is semilunar, with a 

 rimule and lyrula. The frontal is surrounded with lateral areolae and 

 formed of an olocyst surmounted by a pleurocyst" (Canu and Bassler, 

 1920:533). Genotype, Trigonopora vcnnicularis Maplestone, 1902:23. 



