56 "ENDEAVOUR" SCIEXTIHI RESULTS. 



much variation ; of H. furcata and H. baileyi, however, I have 

 seen 110 specimens except the one of each from which I originally 

 described them. 



Loc. Oyster Bay, Tasmania, 20 fathoms. 



GENUS HAMCOKNOPSIS, Bale. 

 HALICORNOPSIS ELEGANS (Lamarck). 



Plumidaria elegans, Lamarck, Auini. sans \'ert., ii., 1816, 

 p. 129. 



Aglaophenia elegans, Lamom-oux, Hist. Polyp. Cor. Flex., 

 1816, p. 169; Eucyclop. Meth., Zooph., 1824, p. 16. 



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

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



Halicornopsis avicularis, Bale, Journ. Micro. Soc. Viet., 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. Viet., xxiii., 1887, pp. 90, 101. Marktanuer. 

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



Azygoplon rostratam, Allrnan, Rep. Sci. Results " Challenger " 

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



Halicornopsis 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. Ixxxix., 

 fig. 1. 



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

 that of Kii'chenpauer, who described it as new in 1872, under 

 the name of Aglaoplienia avicularis. Later it was successively 

 described as new by myself and Allnian, 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 Plumidaria eleguiis, 

 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 I have farther observed, in 



