BY W. M. BALE. 773 



THUIARIA FENESTRATA, Bale. 



Moreton Bay, Queensland ; Port Phillip Heads, Victoria. 



This species must be added to the list of those which occur on 

 both the southern and north-eastern coasts, as I have received 

 from Dr. MacGillivray a fine specimen obtained at Port Phillip 

 Heads. The shoots are very numerous, and form a densely 

 matted tuft ; the two series of calycles are rather closer together 

 than in other specimens which I have seen. Gonothecse were 

 present, and differ from the figure and description given in the 

 " Catalogue," the border being plain. In representing the 

 gonotheca as having four emarginations of the border, I followed 

 a drawing of Mr. Busk's taken from a hydroid in the Gay 

 herbarium, labelled Solatia tetracyUarcij'&nd identical with his 

 Sertularia crisioides (T. Jenestrata). The present specimens 

 however, exhibit no trace of any toothed or emarginate state of 

 the border. 



PLUMULAEIID^E. 



ELEUTHEPvOPLEA. 



AZYGOPLON, n.gen. 



Hydrophyton pinnate, supracalycine sarcothecae absent, mesial 

 anterior sarcotheca not adnate to the hydrotheca, nor in contact 

 with it. 



Gonosome without phylactocarpal appendages. 



This genus (of somewhat doubtful position) is proposed for the 

 reception opthe species which I originally described under the 

 name of Plumularia producta, and is characterised mainly by the 

 absence of supracalycine sarcothecse, a feature which it exhibits 

 in common with the genera Halicornopsis (Azygoplon, Allman) 

 and Diplocheilus. The latter genus, however, is said to be dis- 

 tinguished by the presence of an external calycine envelope, and 

 the former has the anterior sarcothecee adnate to the front of the 

 hydrothecse, as in other Statoplea; while in Azvgoplon the 



