iivniioiDs — Binncs. 43 



Distribution. — Pteviously leoorded fiuni Griffith Point, Victoria 

 (Bale); Laysau Island, Hawaiian Archipelago (Hartlaub); Gulf of 

 Manaar, Ceylon (Tliornely) ; Flying-Fish Cove, Christmsis Island, Indian 

 Ocean (Ritchie) ; East Indies (Billard) ; Tasmania (Briggs) ; Great 

 Australian Bight; South Australia; Bass Strait (Bale). 



Plumulabia sPiNnLOSA, Bale. 

 Phnnnlaria spimdosu, Bale, Jonrn. Micro. Soc. Vict., ii., 1882, p. 42, 

 pi. XV., tig. 8. Id., Bnle, Cat. Austr. Hydroid Zoophytes, 1884, 

 p. 139, pi. xii., fig. 11-12. III., Tjendenfeld, Pioc. liinn. Soc. 

 N.S.Wales, ix., 1885, p. 475. Id., Bale, Ihid. (2), iii., 1888, p. 788, 

 pi. xix., fig. 11-13. /(/., Warren, Ann. Natal Govt. Mus., i., 3, 

 1908, p. 320. ^7., Mulder and Trebilcock, Geelong Naturalist (2), 

 iv., 4, 1911, p. 123, pi. iii., fig. 9, 9a. 



Specimens of this minute and delicate species occur creeping over the 

 surface of seaweeds. The colonies do not exceed 6 mm. in height. The 

 hydrothecfe approach most closely those of Bale's figure^'^ (pi. xix., 

 fig. 11) of a specimen from Coogee, New South Wales, in which the 

 hydroclades terminate in a blunt conical point at the level of the margin 

 of the hydrotheca, instead of being produced upwards into an incurved 

 spine. The transverse markings of the liydrorhiza, to which Bale and 

 Warren refer, are here well developed as thickenings of the perisarc 

 which project into the interior of the hydrorhizal tubes. 



Warren states that the gonosome is unknown. Bale, however, 

 figures^s the gonangia and refers to them as " very large, ovate, truncate 

 above, and with the margin rather widely everted." According to meas- 

 urements deduced from Bale's figures the gonangia have a length of 1*05- 

 1"1 mm., and a maximum diameter of 0"46-0"47 mm. 

 Dinieiisiniis. — 



Stem internode, length .. . ... ... ... ... 0'26-0"29 mm. 



Stem internode, diameter ... ... ... 0"04-0'05 mm. 



Hydroclade, length 0-26-0-28 mm. 



Hydroclade thecate internode, length ... ... 0-22-0-23 mm. 



Hydi'oclade intex-mediate internode, length... ... 0-04-0 -05 mm. 



Hydi'oclade internode, diameter ... ... ... 0"03-0"05 mm. 



Hydrotheca, depth 0-12-0-14 mm. 



Hydrotheca, diameter at mouth ... ... ... 0"14-0"17 mm. 



Loc. — Growing on sea-weeds thrown up on the sandy beach of the 

 lagoon, Lord Howe Island. 



Distrihutioii. — Previously recorded from Queenscliff, Victoria (Bale) ; 

 Timaru, New Zealand (Lendenfeld) ; Coogee, New South Wales (Bale) ; 

 Park Rynie, Natal (Warren) ; Barwon Heads, Victoria (Mulder and 

 Trebilcock). 



Genus Halicornakia, All man. 

 HaLICORNARIA ASCJDIOIDES (Hale). 



(PI. vi., fig. 3.) 



Aglaophetiia ascidioides, Bale, Jouru. Micro. Soc. Vict., ii., 1882, p. 32, pi. 

 xiii., fig. 5. 



i-i Bale— Proc. Linn. Soc. N.S. Wales (2), iii., 1888, p. 783, pi. xix., fig. 11. 

 15 Bale— Proc. Linn. Soc. N.S.Wales (2), iii., 1888, p. 783, pi. xix., figs. 12-13. 



