34 
THE VOYAGE OF H.M.S. CHALLENGER. 
(3) Amathia brasiliensis, n. sp. (PL VII. fig. 2). 
Character. — Zoarium several inches high (?), irregularly branched; branches frequently 
terminating in two long jointed filaments, w T hich occasionally throw out one or two 
isolated zooecia or stunted branches at the nodes. The branches sometimes also 
commence with two or three barren internodes. Stems about 0'3 mm. in diameter, wall 
white and delicate. Zooecia disposed in a more or less complete spiral, which in the 
younger internodes occupies only the upper part, but in the older nearly their entire 
length; very distinct, subcylindrical, tapering from the base upwards, about 0‘6 x OT mm. ; 
neck long and slender. 
Habitat. — Off Bahia, 10 to 20 fathoms, mud. 
The striking peculiarity of this form is the tendency of the branches to terminate in 
two long jointed tags (terminals), usually barren, but sometimes giving off one or two 
scattered isolated cells in the manner of some of the Vesiculariae, &c. The comparative 
distinctness of the zooecia in the spiral series shows a tendency in the same direction. 
(4) Amathia spiralis, Lamouroux (PI. VI. fig. 2). 
Amathia spiralis, Lamx., Polyp. Flex., p. 161, pi. iv. fig. 2. ; Expos., p. 10, pi. lxv. figs. 16-17 ; 
Encyclop., p. 44. 
Serialaria convoluta, Lamarck, Scliweigger. 
1 Serialaria spiralis. Woods, Proc. Roy. Soc. N.S.W., vol. xi. p. 84, 1877. 
1 Amathia bicornis, Woods, Trans. Roy. Soc. Viet., vol. xvi. p. 102, 1880. 
Character. — Zoarium very thick, branched subdichotomously or irregularly, several 
inches high. Zooecia subcylindrical, of uniform diameter, very closely connate, DO mm. 
long, by 0’2 mm. in diameter (at base); the exserted neck thick and very strongly 
wrinkled ; transversely disposed in an apparently continuous spiral from one infernode to 
another, though in reality probably discontinuous at each internode. 
Habitat. — Station 161, off entrance to Port Philip, 33 fathoms, sand. Station 162, 
off East Moncoeur Island, Bass Strait, 38 fathoms, sand and shells. Station 163a, ofl 
Twofold Bay, 150 fathoms, green mud. 
[Bass Strait and Australia, ubique(V), Lamx., &c.] 
(5) Amathia tortuosa, Woods, (PI. VI. fig. 1). 
1 Amathia tortuosa, Woods, Proc. Roy. Soc. Viet., vol. xvi. p. 89, fig. 6. 
Character. — Zoarium 3, 4 or 5 inches high, in thick tufts, when spread out; 
divaricate, with long subalternate branches ; rooted by radical fibres. Dull olive green 
colour. Stem 0'5 to (P6 mm. in diameter. Zooecia slender, about 1 mm. x 0T5 to (P2 mm., 
disposed spirally round the internodes, but not always forming quite one turn. 
