56 " ENDEAVOUR " SCI1 Mil K Rl SI I /J •. 



much variation ; of H". furcata and //. /'■<ilriii, however, I have 

 seen no specimens except the one of each from which I originally 

 described them. 



Loc. — Oyster Bay, Tasmania, 20 fathoms. 



Genus Hamcornopsis, Bale. 

 Halicornoi'Sis elegans (Lamarck). 



Plumularia elegam, Lamarck, Anim. sans Vert., ii., 1816, 

 p. 129. 



Aglaophenia elegant, Larnouroux, Hist. Polyp. Cor. Flex., 

 1816, p. 169;'Encyclop. Meth., Zooph., 1824, p, 16. 



Aglaophenia avicularis, Kirchenpauer, Abh. Nat, Ver. Ham- 

 burg, v., 1872, p, 33, pis. i, and iii., tig. 3. 



Halicornoj)sis avicularis, Bale, Journ. Micro. Soc. Vict., ii,, 

 1881, p. 26, pi. xiii., fig. 3 ; Cat. Austr. Hyd, Zooph., 1884. 

 p. 185, pi. x., figs, 1, 2, pi. xix., fig. 32 ; Trans, and Proc- 

 Roy. Soc. Vict., xxiii., 1887, pp. 90, 101. Marktanner. 

 Tnrneretscher, Ann. k.k. Hofmus. Wien, v., 1890, p. 279. 



Azygoploii rostratum, Allman, Rep. Sci. Results " Challenger " 

 Exp., Zool., vii., 1883, p. 54, pi. xix, fig. 1-3. 



llalicomopsis elegans, Billard, Ann, Sci. Nat., Zool., (9) v., 

 1907, p. 323; Comp. Rend., cxlvii., 1908, p. 940; Ann. Sci. 

 Nat., Zool., (9), ix., 1909, p. 329; Ibid, (9) xi., 1910, p. 44. 

 Ritchie, Mem. Austr. Mus., iv., 1911, p. 855, pi. lxxxix., 

 fig. 1. 



The first account of this species which was of any value was 

 that of Kirchenpauer, who described it as new in 1872, under 

 the name of Aglaophenia avicularis. Later it was successively 

 described as new by myself and Allman, under the respective 

 names of Halicornopsis avicularis and Azygoplon rostratum ; 

 but Billard, in 1907, announced from his examination of the type 

 specimens that it was identical with the Plumularia elegans, 

 Lamarck, a species which had been described both by Lamarck 

 and Lamouroux, but not in such a way as to render it identifiable. 

 None of the descriptions were complete and correct in all 

 particulars, while one important feature — the presence of a 

 median sarcostyle behind the hydrotheca — remained unnoticed 

 till pointed out by Ritchie; and 1 have further observed, in 



