208 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



KEBELLA NEGLECTA Stechov, 



Hebella ncglecta Stechow, Zur Kenntnis neuer oder seltener Hydroid- 

 polypen, etc., 1914, p. 139. 



Our specimens answer very well to Stechow's description and 

 figures, having large cylindrical hydrothecae with everted rim and 

 noncorrugated walls. The pedicels are short and not annulated. 



Gonosome. — Not known. 



Locality. — Dredging station 5413, between Cebu and Bohol, near 

 Lauis Point, 10° 10' 35" N., 124° 3' 15" E.; depth, 42 fathoms. 

 Growing on Actnjptolaria normani. 



Distribution. — Uraga Kanal, Japan (Stechow). 



HEBELLA SPIRALIS, new species 

 Plate 40, figs. 4, 5, 6 



Colony parasitic, growing as a creeping root stalk over a large 

 pinnate sertularian hydroid, completely invading all its stem and 

 branches. 



Trophosonie. — Hydrocaulus simple, sinuous in its course, and send- 

 ing off usually alternate hydrothecae. On the main stem of the host 

 this parasitic root stalk forms an intricate network of delicate often 

 anastomosing pattern. Hydrothecae irregularly scattered on the 

 main stem of the host but tending to be opposite on the pinnae, al- 

 though this feature is by no means constant. The hydrothecae are 

 in the form of spirally twisted tubes, in some cases there being about 

 one and one-half turns to the spiral, and there is great variation in 

 the closeness of the twist, some being rather tightly coiled and others 

 drawn out into a very loose spiral. The aperture is normally round 

 and the rim even. There is sometimes, not by any means always, a 

 thickening of the rim and a small but evident diaphragm at the 

 bottom of the hydrotheca separating its cavity from that of the 

 pedicel. Pedicel very short and broad, but evident. Owing to the 

 torsion of the hydrothecae the pedicel is hard to see under ordinary 

 circumstances. When the root stalk from which they spring is on 

 the upper surface of a pinna the hydrothecae are twisted around so 

 as to face downward. 



Locality. — Dredging station 5477, between Samar and Leyte, 

 vicinity of Surigao Strait, Tacbuc Point, 10° 44' 45" N., 125° 12' 

 30" E.; depth, 48 fathoms. 



Holotype. — Cat. No. 42175, U.S.N.M. This form is nearest to 

 Hebella contort a Marktanner-Turneretscher u from Singapore, from 

 which it differs in a much greater torsion of the hydrothecae, which, 

 according to the figures given by the describer, are but slightly 

 twisted, not curved in a spiral as those of 77. spiralis* 



11 Die Hydroiden des k. k. naturhistorischen Hofmuseums. Vienna, 1890, p. 215. 



