Mr. A. W. Waters on Australian Bryozoa. 21 



double as wide and arise from a calcareous crust ; this, how - 

 ever, is at first formed by a growth similar to the creeping 

 branches of 8. tncrassata, and subsequently spreads out. 



This would be Filifascigera of d'Orbigny (Pal. Fr. p. 684), 

 and I have a recent specimen from New Zealand which I 

 cannot distinguish from F. dichotoma, d'Orb. In it the 

 bundles consist usually of four zooecia and the basal portion 

 is punctate without zooecia. In such cases we must look upon 

 the names given as registering the occurrence rather than 

 expressing any opinion on the classification ; and the same 

 would apply to other Cyclostomata. 



Loc. Britain ; Green Point, Port Jackson. 



Diastopora latomarginata^ d'Orb. 

 Diastopora latomarcjinatn, d'Orb. Pal. Fraiif. p. 827, pi. 758. figs. 10- 



12; Waters, Ann. & Mag. Nat. Hist. ser. 5, vol. iii. p. 272, pi. xxiv. 



fig. 12, whicli see for synonyms. 

 Tuhidipora concinna, MacG. Trans. Roy. Soo. Vict. vol. xxi. p. 94, pi. i. 



fig. 10. 



The zooecial tube of the Green Point specimens is a trifle 

 smaller tlian that of my Naples .specimens, measuring only 

 about O'06-0'07 millim., whereas those from Naples are about 

 0*08 millim. In both cases tlie ovicells are inflations trans- 

 verse to the rows of the zooecia, with the ovicellular duct 

 directed towards the centre of the colony. 



Diastopora is not at all uncommon in the southern hemi- 

 sphere, and it is therefore surprising to find that the autlior of 

 the article on distribution in the ' Encyclopsedia Britannica ' 

 speaks of Diastopora as mostly northern. 



Loc. Living : Arctic Seas ; Mediterranean ; Victoria ; Green 

 Point, Port Jackson. Fossil : Pliocene of Sicily and Italy. 



Idmonea serpens^ Linn. 

 Loc. Living : European Seas ; New Zealand ; Green Point, 

 Port Jackson. Fossil : Pliocene of Europe ; various localities 

 in New Zealand. 



Lichenopora californica^ Busk. 

 Unicavea californica, d'Orb. Pal. Fran^. p. 072. 

 Discoporella californica, Busk, Cat. Mar. Polyzoa, pt. iii. p. .32, pi. xxx. 



fig. 5. 

 Lichenopora californica, Waters, Journ. Linn. Soc, Zool. vol. xx. p. 282. 



pi. XV. fig. 1. 



There are several small specimens from Green Point without 

 ovicells ; but from the other characters they seem to be L. 

 caUforntca. 



Loc. California ; Victoria ; Green Point, Port Jackson. 



