183 HYDR01DA. BALE. 



little circular foramina channels of communication between the 

 different tubes are excessively numerous, often indeed for con- 

 siderable distances almost touching each other. The supple- 

 mentary tubes of A. carinifera on the contrary are much 

 stouter, but fewer, and the foramina few and distant. 



When the second pair of lateral teeth is feebly developed the 

 hydrotheca-margin may become indistinguishable from that of 

 A. billardi or A. tasmanica, except of course in the presence of 

 the conspicuous crest formed by the median ridge. 



Loc. .Great Australian Bight, 130-190 fathoms, 80-120 

 fathoms, 100 fathoms ; Long. 126 Q 451' E, 190-320 fathoms. 



Genus HALICORNARIA, Busk. 



HALICOKNARIA URCEOLIFERA (Lamarck.) 



(Plate xxxvii., figs. 5-6,) 



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

 p. 125. 



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

 burg, v., 1872J p. 29. 



Halicornaria urceolifera, Billard, Ann. Sci. Nat. Zool., (9), 

 v., 1907, p. 324, fig. 1 ; Bale, Report on the Hydroida, 

 "Endeavour" Results, ii., 1914, p, 51, pi. v., fig. 4, pi. 

 vii., fig. 5 (var. scandens.) 



Hydrocaulus monosiphonic, unbranched or with few small 

 branches, reaching a foot in height; hydrocladia alternate, two, 

 or rarely one, on an iuternode, at an angle of about 45, and 

 both series directed towards the front ; nodes transverse or 

 slightly oblique. 



Hydrothecas cup-shaped, deep, set at an angle of about 40, 

 without intrathecal ridge ; border with a small anterior tooth 

 which, along with the part of the hydrotheca-wall immediately 

 below it, is abruptly bent inward, the first tooth on each side 

 erect, a large triangular tooth or lobe near the middle on each 

 side, widely everted, and another lobe smaller and more rounded, 

 adjoining each latei'al sarcotheca ; back entire, acliiate ; the 

 hydropore with a few minute denticles on the margin. No septal 

 ridges in the internode. 



Mesial sarcotheca about two-thirds the length of the hydro- 

 theca, projecting free portion short, with two small sub-tubular 

 apertures besides the inferior one. Lateral sarcothecaa large, 



