38 
THE YOYAGE OF H.M.S. CHALLENGER. 
neck retracted, about 0’4 mm. long by 0'07 to 0‘09 in diameter, cylindrical and of uniform 
diameter throughout, quadrangular at the orifice when the neck is retracted. Supported 
on a long peduncle. Surface of peduncle and lower part of cells very finely wrinkled. 
Habitat. — Off Bahia, 10 to 20 fathoms, mud. On Amathia brasiliensis and Amathia 
distans. 
Family III. Cylindrcecida;. 
Cylindroeciidx , Hincks, Brit. Mar. Polyz., p. 534. 
Vesiculariadx (pars), Bk., Alder, Hincks. 
Vesicular iex (pars), Smitt. 
Character. — Zooecia not deciduous, arising from, and apparently continuous with, the 
stolon or segment from which they spring. Walls earthy or argillaceous. 
The Family here contains the following : — 
1 . Cylindroecium , Hincks. 
(1) Cylindroecium pa, puense (PL VIII. fig. 2). 
1 . Cylindroecium, Hincks. 
Farrella (pars), Bk. 
Avenella, Hincks, Gosse (nec Dalyell). 
Cylindroecium , Hincks, Brit. Mar. Polyz., p. 535. 
Vesicularia (subg. Avenella, pars), Smitt. 
Character. — Zooecia uniformly cylindrical or slightly ventricose below, sometimes 
dilated at the base. Stolon slender, creeping, with occasional enlargements. Zooecia 
wide apart or sometimes crowded. 
(1) Cylindroecium papuense, n. sp. (PI. VIII. fig. 2). 
Character. — Zoarium a creeping adherent stolon with occasional bulbous thickenings. 
Zooecia cylindrical, of uniform diameter and not dilated at the base, 1*3 mm. long by 
0'1 to Oil mm. in diameter, springing either singly and widely apart from the stolon, or 
four or five together from a bulbous thickening. 
Habitat. — Station 188, lat. 9° 59' S., long. 139° 42' E., 28 fathoms, green mud. 
P arasitic on Amathia semispiralis, Kirchenp. 
