PAPERS READ. 



ON SOME NEW AND RARE HYDROIDA IN THE 

 AUSTRALIAN MUSEUM COLLECTION. 



By W. M. Bale, F.R.M.S. 



(Plates XII.-XXI). 



The species of Hydroida treated of in the present paper were (with 

 one exception) included in a collection sent to me by Dr. Ramsay, 

 from the Australian Museum, about the end of the year 1886. Besides 

 a number of new species there were represented several which had 

 previously been very imperfectly known, for one of which — the 

 Geratella fusca of Gray-— I have found it necessary to constitute 

 a new family. Among the other specimens were a number of 

 Dr. von Lendenfeld's types of the species described by him in the 

 Linnean Society's Proceedings, several of which prove to be 

 identical with species previously known. I have to thank Mr. T. 

 Whitelegge, of the Australian Museum, for forwarding me addi- 

 tional specimens of some of the species, and also for notes of his 

 examination of some of those in the Museum. 



The type specimens from Dr. von Lendenfeld's collection, include 

 the following — the references being to the Proceedings of the 

 Linnean Society of N.S. Wales, Vol. IX. 



Sertularella microgona, von Lendenfeld. 

 P.L.S.N S.W. IX., p. 416, PI. VII., tigs. 1-3. (See page 763). 



Diphasia symmetrica, von Lendenfeld. 

 I.e. p. 414, PI. VIII., fig. 7. 

 This is identical with Sertularia bispinosa, Gray. 



