282 A MONOGRAPH OF THE AUSTRALIAN SPONGES, 



PAPERS READ. 



A ]\IONOGEAPH OF THE AUSTRALIAN SPONGES. 



By R. von Lendenfeld, Ph.D. 



Part V. 



THE AULENIN^. 



Plate XXVI. to XXXV. 



III. ORDO. CERAOSPONGIvE. Bronn (1). 



SPONGI^ WITH A SKELETON COMPOSED OF HORNY FIBPvE. 

 SILICEOUS SPICULES PRODUCED BY THE SPONGE ITSELF 

 MAY OCCUR IN THE GROUND SUBSTANCE, FLESHSPICULES, 

 BUT NEVER WITHIN THE FIBRES. 



I._SXJB-ORDO. MICROCAMER^. 



CERAOSPONGI/E WITH SMALL SPHERICAL CILIATED 

 CHAMBERS. 

 The study of a great many forms has led me to consider the size 

 and shape of the ciliated chambers as a more important charac- 

 teristic, than the structure of the horny fibre, whether solid or 

 filled with pith. To express the mutual relationship of the horny 

 sponges according to this idea, [ divide the Ordo Ceraospongise 

 into the two Sub-orders Microcameroe, with small spherical ; and 

 Macrocamerae, with large oval ciliated chambers. To the first 

 Sub-order I reckon the Spongidse, Aplysinidaj and Hircinidse, and 

 to the second the Spongelidae and Aplysillida?. 



(1) Bronn. Classen unci Ordnungen des Thierreiches, Porifera Iste 

 Auflage. 



