ininjoins — RivMGCis. ,37 



(it'lius SkktuLAU'IA, Liinni'MS. 



Skimti.ai.'IA r.isriXdSA ((Irdij). 



Serti'laritt bittpiiiosa (Uiuj), Nutting, Ainei'icau Jlydroids, pt. II., — 

 Sertularidge, 1904, p. 5G, pi. ii., tig. 8-11 (syuoiiymy). 



A few tragmeutaiy but typical exazi]23les of tliis species were found 

 eutaugled with Sertnlarellii sabartlculata (Coughtrey). Gouaugia are 

 present on several of the specimens. 



Duiieiisioiis. — 



Stem internode, length 0-oO-0-66 mm. 



Stem internode, diameter at base of liydiotheca ... U-26-0'31 mm. 



Hydrotlieca, leugtli of external profile ... ... (J'38-0--i3 mm. 



Hydi'otlieca, lengtli of free portion ... ... ... U-28-U-33 mm. 



Hydrotlieca, length of aduate portion ... ... (>-17-0"19 mm. 



Hydrotheca, diameter at mouth ... ... ... (Ji4-0-15 mm. 



Gonangium, length up to 2 mm. 



Gonangium, maximum diameter ... ... ... up to 1 "5 mm. * 



liemark. — Leviuseni*^', iu his " Systematic Studies on the Sertulariidse," 

 refers iSertularia bisj)iuu><t( (Gray) to his new genus Udo)i.totheca. 



Loc. — Lord Howe Island. Entangled with SertnlareUa subarticulata 

 (Coughtrey). 



Jjiatribatioii. — Previously recorded from New Zealand (Gray, 

 Hutton, Lendenfeld) ; Brighton, South Australia; Bass Strait ? (Bale) ; 

 Victoria (Lendenfeld, Bale, Mulder and Trebilcock) ; Indian Ocean 

 (Marktauner-Turneretsclier) ; East coast of South America (Nutting). 



SkKTULAKIA MINIMA, ThompSOII. 



Sertularla viiniiua, Bale, Biol. Res. "Endeavour," iii., 5, 1915, p. 269 



(synonymy). 



Many small colonies belonging to this widely-distributed species, and 

 averaging 2-3 mm. in height, occur creeping over the fronds of seaweeds. 

 The minute characters of tlie trophosome are quite typical. The 

 transverse markings in the hydroi"hiza in the form of perisarcal 

 thickenings are well developed. 



Mulder and Trebilcock^i have drawn attention to the pix-seuce of two 

 small external ajjertures at the base of the chamber (" iufrathecal 

 chamber") below each pair of hydrothecae. These apertures are small, 

 circular holes from which short, fragile tubes prutrude. I have not been 

 able to detect on my specimens the presence of these apertures, which 

 Mulder and Trebilcock found on their specimens from the Victorian 

 coast. These writers, however, point out that in typical specimens "the 

 tubes are nearly always absent .... and the apertures small and 

 difficult to detect. Sometimes they are missing altogether." In the case 

 of typical specimens from Port Phillip, Victoria, Bale found very few of 

 these orifices. An examination of Kitchie's sj)ecimens of S. viiuiuia 

 obtained by the " Thetis " on the coast of New South Wales reveals the 

 presence of these orifices on several of the interuodes. 



i» Levinsen — Vidensk. Medd. fra den naturh. Foren, 64, 1913, pp. 273, 308. 

 11 Mulder and Trebilcock — Geelong Naturalist, vi., 2, 1914. p. 39. 



