38 THE VOYAGE 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. — Ofi" Bahia, 10 to 20 fathoms, mud. On Amathia hrasiliensis and Amathia 

 distans. 



Family III. Cylindrcecid^. 



Cylindrmcildm, Hincks, Brit. Mar. Polyz., p. 534. 

 Vesicular iadx (pars), Bk., Alder, Hincks. 

 Vesiculariex (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 FamUy here contains the following : — 



1. Cylindrcecium, Hincks. 



(1) Cylindrcecium papuense (PI. VIII. fig. 2). 



1. Cylindrcecium, Hincks. 



Farrella (pars), Bk. 

 AveneUa, Hincks, Gosse (nee Dalzell). 

 Cylindrcecium, Hincks, Brit. Mar. Polyz., p. 535. 

 Vesicularia \snbg. AveneUa, pars), Smitt. 



CJiaracter. — Zocecia uniformly cylindrical or slightly ventricose below, sometimes 

 dilated at the base. Stolon slender, creeping, with occasional enlargements. Zocecia 

 wide apart or sometimes crowded. 



(l) Cylindrcecium papuense, n. sp. (PI. VIII. fig. 2). 



Character. -^-ZoeLrinm a creeping adherent stolon with occasional bulbous thickenings. 

 Zooecia cylindrical, of uniform diameter and not dilated at the base, TS mm. long by 

 O'l to O'll mm. in diameter, springing either singly and widely apart from the stolon, or 

 four or five together from a bulbous thickening. 



Habitat.— EtsLtion 188, lat. 9° 59' S., long. 139° 42' E., 28 fathoms, green mud. 

 Parasitic on Amathia semispiralis, Kirchenp. 



