Australian H/jdroUh. J 17 



branches are all directed to one side, and so appear at first sight to 

 be uniserial; in reality, however, they originate in two planes about 

 90 deg. apart, but are then dii'ected so decidedly forward that when 

 mounted they fall to the same side, and seem to have a secund dis- 

 position. A more important distinction, however, is the arrange- 

 ment of the ultimate ramules, which in F. wilsoni are biserial, and 

 like the branches are in two planes about 90 deg. from each other. 

 They are, as a rule, alteriiate, but there are sometimes irregularities 

 in their disposition, such as two occurring in succession on the same 

 side. This arrangement, and the very much more pronounced 

 annulation, distinguish the polypidom from that of P. australis. 



The only specimens I have seen consisted of two mounted pieces, 

 and Mr. Wilson was unable to say what the size of the original 

 specimen had been, or to give any further details of the ramification. 



Hebklla scandkns (Bale.) (Plate XTT., Fig. 10). 



Lafo'ea scandens, Bale, Proc. Lin. Soc. N.S.W.. 2nd Ser., 



iii.. 1888. p. 758, pi. xiii.. figs. 16-19. 

 Hehella scandens, Marktanner-Turneretscher, Ann. d. k. k. 



Xaturh. Hofmus., v.. 1890, p. 2U, ;pl. iii., fig. 16; 



Farquhar. Trans. X.Z. Inst., xxviii.. 1896, p. 460; Cam- 



penhausen, Zool. In.st. d. Univ. Jena. 1897, p. 307 (?); 



Hartlaub, Zool. Jalirl).. Suppl. vi.. iii.. 1905, p. 587; 



Warren, Ann. Nat. (tov"!. Mus.. i.. 1908. p. .'Ml, fig. 21 ; 



Levinsen, Vidensk. Medd. f. d. naturli. Foren, 64, 1913, 



p. 285. 

 Lirtorelln xrandens. Borradaile, Fauna and Oeogr. of flie 



Maid, and Laccad. Archipel. ii., 1905, p. ,840. 

 Hehella cyl I nd rieii (in part). Pictet, Rev. Suisse de Zoo].. 



i.. 189.-^ ].. 41, pi. ii.. fig. 36; Verslnys. Mem. .k- la 



Soc. Zool. de France, xii., 1899. p. 31. 

 Lafoia calcarata (in part), Billard, Bull, du Mus. d'Hist. 



nat., 1904, p. 481; id., Exp. Sci. du Trav. et du Talis- 

 man, viii., 1907, p. 174. 

 Hehella cah-arafa (in part), Billard, Arch, de Zool. Exp. et 



Gen.. 4 ser.. vii.. 19(l7. p. 339; Ritchie. Proc. Zo.,1. 



Soc. Lond.. I'llO. p. 81(1; id.. Mem. Austi-. .Miis.. iv.. 



1911, p. 816. 

 Hehella roiitorfa, .Maiktanner-Turneretscher. Ann. d. k. k. 



naturh. Hofmus.. v.. 1890, p. 215, pi. iii., fig. 17 a, b; 



Campenhausen, Zool. Inst. d. Univ. Jena, 1897, p. 307; 



Levinsen, Vid. Medd. f. d. naturh. Foren. 64, 1913. p. 



285, pi. v., figs. 16, 17. 



