HYDROIDA. BALE. 247 



Halecium balei, Fraser, Bull. Lab. Nat. Hist. State Univ. 

 Iowa, vi., 1911, p. 46. 



No. 16, Halecium sp., Inaba, Zool. Mag. Tokyo, 1890, figs. 

 41-45. 



Not Halecium gracile, Verrill, Report on the Invertebrate 

 Animals of Vineyard Sound, 1874, p. 729. Id., 

 Nutting, Bull, U. S. Fish. Comm., 1901, p. 358, fig. 54. 



The specimens observed were small and monosiphonic, 

 agreeing with the form originally described by me as H. 

 gracile. In treating it as synonymous with the much larger 

 H. flexile of Allman, I follow Billard, who has examined the 

 type in the " Challenger " collection. 



Locs. Forty miles west of Kingston, South Australia, 30 

 fathoms. 



Ten miles north of Circular Head, Tasmania. 



Family LAFOEID^. 



The species here referred to the Lafoeidse belong to the 

 genera Perisiphonia, Cryptolaria, Hebella, and Lafoea. These 

 genera, with others nearly allied to them, are generally recog- 

 nised as members of the family ; Levinsen, however, giving it 

 a more comprehensive signification, would assign to it also 

 " the species referred to Synthecium, Hypopyxis, Staurotheca, 

 and the inoperculate species referred to Dictyocladium, 

 Selaginopsis, Sertularia and Sertularella."' 1 Species belonging 

 to these groups are dealt with in this Report under the 

 Sertulariidae. 



Genus PERISIPHONIA, Allman. 

 PERISIPHONIA EXSERTA (Busk). 



Cryptolaria exserta, Busk, Quart. Journ. Micro. Sci., vi., 1858, 

 p. 130, pi. xix., fig. 3-3b. 



Perisiphonia filicula, Allman, Rep. Sci. Results "Challenger " 

 Exped.,Zool., xxiii., 1888, Hydroida, pt. II., p. 44, pi, 

 xxii., figs. 1-4. 



Zygophylax (Perisiphonia) filicula, Clarke, Mem. Mus. Comp. 



Zool. Harvard, xxxv., 1907, p. 16. 

 Perisiphonia exserta, Ritchie, Mem. Austr. Mus., iv., 16, 



1911, p. 834, pi. Ixxxvii., fig. 3. Id., Stechow, Abh. 



math.-phys. Klasse K. Bayer Akad. der Wissensch., 



iii. Suppl.-Bd., 1913, p. 117. Id., Briggs, Rec. Austr. 



Mus., x., 10, 1914, p. 290. 



1. Levinsen Systematic Studies on the Sertulariidae Vidensk. Medd 

 fra den naturh. Foren, Ixiv., 1913, p. 286. 



