34 THE VOYAGE OF H.M.S. CHALLENGER. 



(3) Amathia brasiliensis, n. sp. (PI. VII. fig. 2). 



Character. — Zoarium several inches higli (?), irregularly branched; branches frequently 

 terminating in two long jointed filaments, which occasionally throw out one or two 

 isolated zocecia or stunted branches at the nodes. The branches sometimes also 

 commence with two or three barren intemodes. 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 0"1 mm. ; 

 neck long and slender. 



Habitat. — Ofi" 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 ofi" one or two 

 scattered isolated cells in the manner of some of the Vesicularise, &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. Ixv. figs. 16-17; 

 Encyclop., p. 44. 



Serialaria coiivoluta, Lamarck, Scliweigger. 

 tSerialaria spiralis, Woods, Proc. Roy. Soc. N.S.W., vol. xi. p. 84, 1877. 

 "i Amathia bicornis. Woods, Trans. Eoy. Soc. Vict., vol. xvi. p. 102, 1880. 



Character. — Zoarium very thick, branched subdichotomously or irregularly, several 

 inches high. Zooecia subcylindrical, of uniform diameter, very closely connate, TO 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 internode 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 Moncceur Island, Bass Strait, 38 fathoms, sand and shells. Station 163a, off 

 Twofold Bay, 150 fathoms, green' mud. 



[Bass Strait and Australia, M6zg'Me(?), Lamx., &c.] 



(5) Amathia tortuosa, Woods, (PI. VI. fig. 1). 



1 Amathia tortuosa, Woods, Proc. Koy. Soc. Vict., 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 0"6 mm. in diameter. Zooecia slender, about 1 mm. x 0"15 to 0"2 mm., 

 disposed spirally round the internodes, but not always forming quite one turn. 



