NO. 1 fraser: hydroids 59 



Gonosome. — Gonangia appearing in pairs on the more distal hydro- 

 cladial processes; concavo-convex, with the concave side toward the 

 stem; shaped like a bent pear. 



Distribution. — North of Wenman Island, 100-150 fathoms. 



This species is a typical Antennularian except for the hydrocladial 

 arrangement, which is as definitely Plumularian. In this it agrees with 

 Nanertesia disticha (Heller). 



Antennularia irregularis, new species 

 Plate 13, Fig. 67 



Trophosome. — Colony plumose, 5 cm. high; nodes not regularly 

 placed or well marked. Slender hydrocladia irregularly arranged, on 

 several sides of the stem, proximally, but with a tendency to an oppo- 

 site arrangement, distally ; sometimes regularly alternate, at other times, 

 subopposite. It is difficult to describe the hydrocladia, as no two are 

 quite alike. In some cases the proximal internode is hydrothecate, in 

 others there may be one, two, or even three nonhydrothecate internodes 

 before the first hydrothecate internode; there may be one, two, or three 

 intermediate internodes; all or nearly all of them have a distinct ridge 

 near each end. Each internode bears a mesial nematophore, some of the 

 intermediate internodes, two; there are two supracalycine nemato- 

 phores. A cauline nematophore is present on the shoulder that bears 

 the hydrocladium and, in some cases, one is present on the medial por- 

 tion of the internode. 



Gonosome. — Not observed. 



Distribution. — South of La Plata Island, 45-55 fathoms. 



Antennularia tetraseriata, new species 

 Plate 14, Fig. 68 



Trophosome. — Stem stout (fragment 2 cm. long), simple, canalicu- 

 lated with large canals. Hydrocladia in four series, in two opposite 

 pairs, i.e., decussate; each hydrocladium arises from a process of the 

 stem about half of the length of the hydrocladial internode. Each inter- 

 node bears one shallow hydrotheca, slightly proximal to the middle of 

 the internode; a distinct septal ridge near each end of each internode. 

 Cauline nematophores in line with the hydrocladial processes, two be- 

 tween each two successive hydrocladia, one large nematophore in the 



