256 Mr. A. W. Waters on Australian Bryozoa. 



dichotomization (see Quart. Journ. Geol. Soc. vol. xl. p. 687). 

 In shape it resembles the ovicell of Grisia (say Grisia 

 Houldsworthii, B., Chall. Rep. pi. iii. fig. 2), but as yet I 

 have only seen it upon the Mediterranean specimens. 



Loc. ISTaples ; Adriatic ; Tortugas ; Bay of Biscay, 2651 

 metres ; Holborn Island {liasw. & W.) ; Azores, 450 fath. 

 Fossil : Testa del Prado, Calabria ( W.) ; and Zanclian, Astian, 

 Sicilian, and Saharian [Seguenza). 



79. Idmonea Milneana, d'Orb. 



For synonyms see Waters, Quart. Journ. Geol. Soc. vol. xl. p. 684, and 



add Busk, ' Clialleno-er ' Rep. p. 13. 

 Tubulipora Baivsoni, Hincks, Ann. & Mag. Nat. Hist. ser. 5, vol. xiii. 



p. 34, pi. ix. fig-. 5. 



The branches of a specimen from Green Point anastomose, 

 forming a colony an inch and a half across, and it differs in the 

 branching from /. interjiincta^ where tubular connexions are 

 thrown across from one branch to another, also the radicles 

 growing from the back of the branches of /. Milneana are 

 stouter, being formed of a fasciculus of tubes. The ovicell and 

 the ovicellular opening of this and /. interjuncta seem iden- 

 tical (see figure 29 on PL VI.), the ovicell being very slightly 

 raised, spreading among a considerable number of zooecia ; 

 the opening is wide, with a raised compressed funnel. Aper- 

 ture of zooecial tube 0'2 millim. wide. 



Mr. Busk, in his ' Challenger ' Report, says " ovicell un- 

 known ; " but this I have previously described from Capri. 

 I have reexamined the British-Museum specimens of /. noto- 

 male^ B., and have no doubt of this being only a synonym ; 

 in fact the Museum specimens of the latter and /. Milneana 

 are so similar that they might well be fragments of the same 

 colony. 



Loc. Living : Falkland Islands {d^ Orb.) • Patagonia, 30 

 fath. _; Chonos Archipelago ; Florida ; S. W. Chili, 0-30 fath. 

 Capri 3 New Zealand {A. W. W.) ; Heard Island, 75 fath. 

 Prince Edward Island, 80-150 fath. ; Fiji Islands, 450 fath. 

 Queensland ; Victoria ; Green Point, Port Jackson, 8 fath 

 Fossil : Latdorf (Oligocene) ; Orakei Bay, New Zealand ; 

 Mount Gambler, Curdie's Creek, Bairnsdale (Australia). 



80. Idmonea interjuncta^ MacG. 

 (PI. VI. fig. 29.) 



Idmonea interjuncta, MacG. Descrip. of New or Little-known Polyzoa, 



pt. ix. (1885), Trans. Hoy. Soc. Vict. p. 10 (sep.). 

 ? Idmonea Pedleyi, Haswell, " Cyclost. Polyzoa of Port Jackson," 



Proc. Linn. Soc. N. S. Wales, vol. iv. p. 351. 



