12 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



Gonosome. — Not observed. 



Distribution. — Off Secas Islands, 25 fathoms; east of islands oflF 

 Navidad Head, 25-35 fathoms; off Isabel Island, 10-25 fathoms. 



Genus TUBIGLAVA 



Tubiclava laxa, new species 

 Plate 1, Fig. 3 



Trophosome. — A colony consists of numerous individual zooids 

 growing out singly from a crust on the surface of gastropod shells; no 

 stoloniferous network shows at the surface. The zooids are protected 

 by a heavy, loose-fitting tube, reaching to the base of the hydranth; this 

 tube may have numerous sand grains embedded in it. In the nutritive 

 zooids, this tube has a maximum length of 35 mm. ; it is nearly tubular 

 or, in some cases, slightly tapering from tip to base. The hydranth is 

 clavate, with 12-14 scattered tentacles. 



Gonosome. — The tube of the generative zooid is short, less than 1 

 mm., but of much the same diameter as that of the nutritive zooid. The 

 sporosacs are closely crowded on the blastostyle; there may be as many 

 as 20 of them. 



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



PTubicIava triserialis, new species 

 Plate 1, Fig. 4 



Trophosome. — Zooids arising singly from a loosely reticular stolon 

 to a height of about 3 mm.; the uncovered hydranth is three eighths 

 of the total length. It is short and stoutly clavate with 20-24 tentacles 

 arranged rather definitely in three closely placed series. The perisarcal 

 tube, which is smooth, is thin but distinct. 



Gonosome. — Not observed. 



Distribution. — On coral, exposed at low tide, along the shore of 

 Braithwaite Bay. 



Genus TURRITOPSIS 

 Turritopsis nutricula McCrady 

 Oceania nutricula McCrady^ Proc. Elliott Soc, 1859, pp. 55-90. 

 Turritopsis nutricula McCrady^ ibid., p. 127. 



Fraser, Hydroids of Beaufort, 1912, p. 345. 

 Distribution. — On sponges associated with solitary corals, exposed 

 at low tide, on the north shore of Tagus Cove; Gorgona Island, on 

 coral, at low tide; South Viradores Island, 8-10 fathoms. 



