340 A MONOGRAPH OF THE AUSTRALIAN SPONGES, 



1. FAMILY SPONGELIDiE. 



Ceraospongife with a skeleton composed of anastomosing horny 

 fibres, with a narrow axial canal, The ground substance clear and 

 transparent without granules. Ciliated chambers large sack- 

 shaped. 



1. SUB-FAMILY SPONGELIN^E. 



Spongelidse without Flesh-spicules. 



2. SUB-FAMILY SPONGELISS^. 

 Spongelidse with Flesh-spicules. 



2. FAMILY SPONGLD.^. 



Ceraospongiee with a skeleton composed of anastomosing horny 

 fibres with very narrow axial canals. The ground substance filled 

 with highly refractory granules and in transparent. Ciliated 

 chambers small, semi-spherical. 



1, SUB-FAMILY SPONGING. 

 Spongidas without Flesh-spicules. 



2. SUB-FAMILY SPONGISSIN^. 

 Spongidse with Flesh-spicules 



III. FAMILY APLYSILLID^E. 



Ceraospongiee with a skeleton composed of tree-shaped and 

 originally not anatomosing horny fibres, with a thick core 

 surrounded by a thin layer of horny substance only. Ground 

 substance transparent without granules. Ciliated chambers large 

 and sack-shaped. 



1. SUB-FAMILY APLYSILLINiE. 

 Aplysillidgc without Flesh-spicules. 



2. SUB-FAMILY APLYSILLISS^E. 

 Aplysillidse with Flesh-spicules. 



