Art. III. — Further Notes on Australian Hydroids, with 

 Descriptions of some New Species. 



(With Plates IIT., IV.. V., VI.) 



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



[Eead April 13, 1893.] 



The hydroids treated of in the present paper were mostly com- 

 prised in a collection made by Mr. J. Bracebridge Wilson, M.A., 

 and forwarded to me a considerable time since for examination 

 and report in connection with the work of the committee 

 appointed by this Society to investigate the fauna of Port 

 Phillip. Many of the species included in the collection had 

 already been described and recorded from that locality, and of 

 these for the most part no particular mention is here necessary ; 

 but in a few cases the specimens present more or less distinct 

 varietal features, which I have duly noted, and in two or three 

 other instances they include the gonangial capsules, which had 

 not previously been observed. A few of the species had not 

 been recorded from Port Phillip, and among them were nine 

 which proved to be new to science. Two of these, however (one 

 of them forming the type of a new family), have since been 

 described and figured with careful and elaborate detail by 

 Professor Spencer in the Transactions of this Society, under the 

 names of Plumularia procumbeiis and Clathrozoon wilsoni. 



One Calyptoblastic species probably represents an undescribed 

 genus, but as the specimens consist merely of the polypidom, I 

 content myself with giving a description and figure (without 

 names), pending the discovery of specimens in a fit condition to 

 admit of its true aflinities being ascertained. The genus Halo- 

 cordyle., not hitherto known to occur in Australia, is represented 

 by a single incomplete specimen. 



Some good examples of Diplocheibis tJiirabiiis, Allman, have 

 on examination satisfied me that the character on which the 

 genus was founded, namely, the presence of a secondary envelope 



