1 16 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



Hydrocladia long — up to 8 mm. — and slender, arising from a promi- 

 nent process on the stem; divided into regular internodes by transverse 

 nodes, all internodes thecate ; the hydrotheca is much nearer the proxi- 

 mal than the distal end of the internode; the septa are faint or absent. 

 There are tvi^o supracalycine nematophores and a mesial nematophore 

 near the proximal, and one near the distal end of each internode; on 

 the cauline hydrocladial process there is a short fixed nematophore, and 

 also a movable one, as well as another at the axil of the process; there 

 are nematophores on the stem, somewhat irregularly arranged, but there 

 is usually at least one between each two successive processes in the same 

 series. 



Gonosome. — Not observed. 



Antennularia septata, new species 

 Plate 18, Fig. 8 



Trophosome. — Stifif looking colonies — up to 10 cm. — grow in clus- 

 ters of as many as 25. Stem, stout, straight, rigid, shows little or no 

 sign of division into internodes. The hydrocladia are given off in regular 

 alternation from the two sides of the stem, in the same plane, each from 

 a distinct process of the stem. The hydrocladium is divided into short, 

 nonthecate, alternating with longer, thecate internodes, the proximal 

 internode being nonthecate; the hydrotheca is near the distal end of 

 the internode. The septa are numerous and much pronounced ; there is 

 one septum near each end of each internode, and one at the base of the 

 hydrotheca in the thecate internode. There are two supracalycine ne- 

 matophores, and a median nematophore on each hydrocladial internode, 

 one on the hydrocladial process, and one large cauline nematophore later- 

 ally placed between each two successive hydrocladia. 



Gonosome. — Not observed. 



Antennularia tetraseriata Fraser 

 Plate 18, Fig. 9 



Trophosome. — See description in Hydroids of the 1934 Allan Han- 

 cock Pacific Expedition, 1938, p. 59. 



Gonosome. — (Not previously described). Gonangia are borne singly 

 on the hydrocladial processes of the stem, scattered, without regular 

 arrangement. There is a basal portion rapidly enlarging from the at- 

 tachment, then rather an abrupt turn to the cylindrical distal portion. 



