HYDROIDA. BALE. 273 



A fragment or two of this species were found among debris 

 from some of the material which had been dried, and the 

 locality is doubtful. 



It would come under the genus Sertularia, as restricted by 

 Levinsen. 



SERTULARIA UNGUICULATA, Busk. 



Sertularia unguiculata, Bale, Biological Results '* Endea- 

 vour," ii., 1, 1914, pp. 11, 16 (synonymy). 



According to Levinsen's classification this species would 

 remain in the genus Sertularia. 



The teeth of the hydrothecae vary extremely in length. 

 They are usually longest in the small forms with widely 

 divergent hydrothecae, the outer tooth especially having the 

 characteristic claw-like form very pronounced. But in the 

 long slender variety mentioned in Part I. many of the hydro- 

 thecse on the proximal portions of the pinnae have the teeth so 

 much abbreviated that when viewed in front the border might, 

 without careful examination, be supposed entire ; at the same 

 time the more distal hydrothecae might at the first glance be 

 deemed to have the outer tooth only, the inner one being much 

 blunter and seen foreshortened. The closer examination of 

 this form strengthens my surmise that the Thuiaria hetero- 

 morpha of Allman may be only a variety of S. unguiculata 

 analogous to the above-mentioned. 



The hydranths have about 20 tentacles. 



Locs. Ten miles north of Circular Head, Tasmania. 



Eastern Slope, Bass Strait, 80-300 fathoms. 



SERTULARIA GEMINATA, Bale. 



Sertularia geminata, Bale, Cat. Austr. Hyd. Zooph., 1884, 

 p. 78, pi. v., figs. 6-7, pi. xix., fig. 15 ; Id., Bale, Bio- 

 logical Results " Endeavour," ii., 1, 1914, p. 10. Id. f 

 Billard, Ann. Sci. Nat., Zool., (9), xi., 1910, p. 22. 

 Id., Mulder and Trebilcock, Geelong Nat., (2), vi., 

 1914, p. 6. 



Desmoscyphus orifissus, Allman, Journ. Linn. Soc., Zool., 

 xix., 1885, p. 143, pi. xvii., figs. 1-4. 



Allman's habit-figure of D. orifissus represents S. geminata 

 very perfectly, but the magnified figure shows the hydro- 

 thecae much inflated at the base, on which account Allman 

 considered his specimens distinct. Billard, however, after 

 examining the " Challenger " types, reports that they do not 

 agree with the figure, and are not separable from S. geminata. 



