HYDROIDA. BALE. 325 



HALICORNARIA FURCATA, Bale, var. INTERMEDIA, Bale. 



Halicornaria intermedia, Bale, Biological Results " Endea- 

 vour," ii., 1, 1914, p. 53, pi. v., fig. 2, pi. vii., figs. 3-4. 

 (Not Halicornaria intermedia, Billard, Les. Hydr. de 

 FExped. du Siboga, I., Plumularidse, 1913, p. 65, pi. 

 iv., fig. 37). 



Halicornaria furcata, Bale, var. intermedia, Bale, Biological 

 Results "Endeavour," ii., 1, 1914, Addendum, p. 1. 

 Id., Brings, Rec. Austr. Mus., x., 10, 1914, p. 298, pi. 

 xxv., fig. 3 ; Id., Briggs, Proc. Roy. Soc. N.S. Wales, 

 xlviii., 1915, p. 310. 



As mentioned in a supplementary slip inserted in Part I., 

 it became necessary to cancel the specific name intermedia 

 owing to Billard's having used the same name while my 

 Report was awaiting publication ; and in preference to 

 proposing another specific name I ranked the form pro- 

 visionally as a variety of H. furcata, pending further know- 

 ledge of the affinities of that species. 



Among the later material received were a number of 

 colonies, most of which agreed fully with the original 

 description ; but in one or two instances a variation occurred, 

 in which each internode of the rachis bore a single hydro- 

 cladium only. 



The variety is habitually associated with Aglaophenia 

 tasmanica, and both hydroids are, up to the present, only 

 recorded from the Tasmanian region. Each was obtained in 

 eight dredgings, in seven of which they were growing 

 together. In the collection from Cape Pillar, Tasmania, 

 reported on by Mr. Briggs, as well as in a number of colonies 

 from near Freycinet Peninsula, Tasmania, they were similarly 

 associated, and Mr. Briggs considers that the Halicornaria 

 always occurs as an epizoon on A. tasmanica. 



Locs. Oyster Bay, Tasmania, 20 fathoms. 



North-east of Babel Island, Bass Strait, 100-170 fathoms. 



East of Babel Island, about 70 fathoms. 



Twenty -one miles N. 65 E. of Babel Island, 73 fathoms. 



Off Babel Island, 60 fathoms. 



Twenty-five miles north-east of Babel Island, 70-100 

 fathoms. 



Off Green Cape, 470 fathoms. 



Thirty-six miles S. 58 W. of Cape Wickham Lighthouse, 

 72 fathoms. 



