4 A MONOGRAPH OF THE AUSTRALIAN SPONGES, 



I. SUB-ORDO. MYXIN^^. Von Lendenfeld. 



MYXOSPONGI.E, THE GROUND SUBSTANCE OF THE MESO- 

 DERM OF WHICH IS A SOFT AND TRANSPARENT GALLERT 

 AND DESTITUTE OF FIBRILLS OR SPICULES. RARELY SUP- 

 PORTED BY DISTANT FIBRES (HALISARCA). THE CILIATED 

 CHAMBERS IN A SURFACE LAYER. THE INTERIOR LACUNOSE 

 AND WITHOUT CHAMBERS. 



This Sub-ordo is identical with the Halisarcinpe of O. Schmidt 



8. FAMILIA. OSCARELLID.E. Von Lendnfeld. 



Myxinse, with spherical ciliated chambers. 



No Australian representatives of this family are known. 



The sole representative, at the same time the type-species of the 

 family is Halisarca lobularis, O. Schmidt (2), Oscarella lobularis, 

 Vosmaer (3). It has been very exhaustively described by F. E. 

 Schulze (4) and others. Halisarca Dujardiui, Johnstone likewise 

 exhaustively described by F. E. Schulze (5) belongs, I think, to 

 another, the following family. The right place can of course not 

 be assigned to those species which have not been investigated 

 in a scientific manner. 



9. FAMILIA. HALISARCID^. Von Lendenfeld. 



Myxinae with sack-shaped, elongated ciliated chambers. 



The type species of this Family is Halisarca Dujardini Johnstone, 

 which has ramified ciliated tubes like certain Sylleibidse. An 

 Australian species which I have discovered belongs to this Family 

 as possessing elongate ciliated chambers, the fibres found in Hali- 

 sarca Dujardini are absent and the ciliated chambers are very 

 regular in shape and never appear ramified. I establish therefore 

 for this species the following new Genus. 



(1) 0. Schmidt. Die Spongien des Adriatischen Meeres. Seite 79. 



(2) 0. Schmidt. L.c. Seite 80. 



(3) G. Vosmaer. Porifera, Classen und Ordnuiigen des Thierreiches. Von 

 Bronn. Band 11. , Tafel VIII. 



(4) F. E. Schulze. Die Gattung Halisarca, Zeitschrift fiir Wissen- 

 schaftliche Zoologie. Band XXVIII. , Seite 1. 



(5) F. E. Schidze. L.c. 



