340 W. M. Bale 



Sertularia minuscula Bale, noni. nov. 



Sertularia minima, Thompson, var. tubatheca, Mulder and 

 Trebilcock, Geel. Nat. (2), vi., 1914, p. 40, pi. iv., 

 figs. L-ld. 

 Sertularia /7z/s/77^/, Bale, "Endeavour" Kept., Pt. iii.,. 



1915, p. 271, pi. xlvi., figs. 3-6. 

 Not S. tuhitheca, Allman, Mem. Mus. Comp. Zool. Harv.,. 



v., 1877, p. 24, pi. xvi,. figs. 5-6. 

 Not *S'. pusilla, Thornley, Willey's Zool. Results, Pt. IV., 

 1900, p. 455. 

 In naming this hydroid S. pusilla, I overlooked the fact that 

 Miss Thornely had already applied that name to another species;: 

 the above name is therefore substituted. 



Sertulauia McCallumi Bartlett. (Plate XVI., Figs. 3-4). 



Serfularella McCalhimi, Bartlett, Geel. Nat. (2), iii., 1907^ 

 p. 62, fig. — . Mulder and Trebilcock, Geel. Nat. (2),. 

 vi., 1914, p. 7, pi. i., figs. 1-3. 



Hydrocaulus simple, divided by oblique joints into short inter- 

 nodes, each bearing a hydrotheca about the middle, internodes with, 

 a sejital ridge« 



Hydrothecae long, conical, smooth, adnate for about one-third 

 of their length, all springing from the front of the hydrocaulus- 

 but widely divergent alternately to right and left, aperture slightly 

 expanding, with two large rounded lateral teeth or lobes. 



Gonothecae 1 



Loc. — Queenscliff; Bream Creek; (Bartlett). 



In this curious species the hydrothecae are borne so much tO' 

 the front as to recall (in side view) the arrangement in Hydrall- 

 jnania, an appearance which is emphasised by the closeness of the- 

 hydrothecae, owing to the shortness of the internodes. The latter, 

 separated by very oblique nodes, have a transverse fold at the- 

 back, accompanied by an internal ridge, less oblique than the- 

 nodes. The aperture of the hydrothecae resembles that of S. 

 macrocarpa, and as in that species the adcauline wall is thickened' 

 up to the margin, which is firm and smoothly outlined. 



In habit the species much resembles Sertnlarella secunda 

 Kirchenpauer, which, however, differs in having a tridentate 

 aperture, as in S. Joh/tstoni. According to Levinsen's system, iSi.- 

 McCalliimi would be ranked under the genusi Odontotheca, 



