58 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



tally, has the usual type of hydrotheca for this genus, with a mesial 

 nematophore just proximal to it (like that of A. gracilis), and a pair, 

 one on each side, much larger, with a trumpet-shaped distal section 

 (like those of A. secundaria) ; the nonhydrothecate internode is short 

 and has but one nematophore. 



Gonosome. — Gonangium, arising from the hydrothecate internode, 

 just proximal to the mesial nematophore, obovate and curved, tapering 

 at the base to a short pedicel; two nematophores where the gonangium 

 joins the pedicel. 



Distribution. — South Bay, Cerros Island, 10-15 fathoms. 



Antennella gracilis Allman 



Antennella gracilis Allman^ Hyd. Gulf Stream, 1877, p. 38. 



Distribution. — South of Clarion Island, 32 fathoms; Secas Islands, 

 25 fathoms; Tangola-Tangola, 15-20 fathoms; off White Friars, 25 

 fathoms; east of islands off Navidad Head, 25-35 fathoms; Isabel 

 Island, 10-25 fathoms. 



Genus ANTENNULARIA 



Antennularia alternata, new species 

 Plate 13, Fig. 66 



Trophoso/ne. — Main stem, 70 mm. long, simple, straight, canalicu- 

 lated. Hydrocladia given off in two series, one on each side of the stem, 

 in the same plane or almost so; those in the two series regularly alter- 

 nating with each other. Each hydrocladium arises from a process of 

 the stem, at least half as long as the first internode; each hydrocladial 

 internode bears one cup-shaped hydrotheca near the middle, adhering 

 to the hydrocladium throughout its whole length. The nodes may be 

 transverse or somewhat oblique; no definite septal ridges. Two-cham- 

 bered nematophores appear on the main stem, usually two between two 

 succeeding hydrocladia on the same side. There is a low, immovable, 

 one-chambered nematophore on a papilla at the base of the hydrocladial 

 process and one movable, two-chambered nematophore farther out on 

 the process; on each internode of the hydrocladium there is a nemato- 

 phore below the hydrotheca and one, some distance above; two immedi- 

 ately above. 



