Art. XVII. — Lord Howe Island Polyzoa. 



By C. M. MAPLESTONE. 



(With Plates XVI II., XIX.). 



[Read 14th October, 1904.]. 



I have lately completed the examination of some seventy 

 mounted slides of Polj^zoa and numerous fragments of shell and 

 coral with adherent encrusting species on them, which were 

 entrusted to me for that purpose by the Rev. Dr. Porter, of 

 Petersham, New South Wales, who collected them at Lord Howe 

 Island. Lat.: 31°. 30' S; Long.: 159°. lO'E. 



As might be expected, the majority of the species represented 

 in the collection were " Australian," but there were some new 

 species among them. 



The following is the list of Australian species found on the 

 Island. 



Scrupocellaria cervicornis, Busk. 

 Tiibucellaria cereoides, Ellis and Solander 

 Beania costata. Busk. 

 Membranipora membranacea, Liiin. sp. 

 Amphiblestriim spinosum, Quoy and Gaimard sp. 

 Thalamoporella rosieri, var. falcifera, Hincks. 

 Cribrilina radiata, Moll. sp. 

 Schizoporella hyalina, Iiinn. sp. 

 „ pachnoides, McG. 



„ biturrita, Hincks. 



„ cecilii, Audouin sp. 



Hippothoa distans, McG. 

 Smittia trispinosa, Johnston sp. 



Two of the specimens of Thalamoporella rosieri var. falcifera, 

 bore ooecia which have not been described. I give an illustra- 

 tration (Fig. 1) showing two of them. They are globular, with 

 a median ridge above the aperture ; the operculum is triangular 

 with an acute apex. The other species do not need any 

 comment, except Smittia trispinosa. This is a verj^ variable 

 species : the form from Lord Howe Island is ver\^ close to 

 variety '' bimucronata," Hincks, which is recorded for Victoria 



