536 a monograph of the australian sponges, 



Colour. 



In the live state unknown. The colour of the beach worn 

 .specimens is light brown. 



Canal System. 



The structure of the skeleton indicates that there are skeletons 

 and askeletous portions, in as much, as rounded grooves are found 

 in great abundance between the ridges of the outer surface. 



Skeleton. 



The main fibres are straight, on an avei-age 0*7 mm., apart and 

 extend from the base upward and outward, terminating always in 

 the tags on the outer surface of the cup. 



They measure 0-1 mm., in thickness and are smooth. They do 

 not contain any foreign bodies, and their surface is accordingly 

 quite smooth. 



The connecting fibres form a very regular network, the meshes 

 of which average 025 mm. Their thickness is 0-04 mm. 



Nothing is known of the histology of this sponge. 



Geographical Distribution. 

 "West Coast of Australia, (Baily.) 



Batiiymetrical Distribution. 

 Shallow water? 



77. SPECIES. EUSPONGIA LEVIS. Nova species. 

 Shape and Size. 



• Euspoiigia levis is a lamellar species and resembles in outer 

 appearance, to a certain extent, forms of the genus Antheroplax. 



From a central mass, which is attached by a small portion of the 

 base, numerous lobate lamellae arise, which are straight or slightly 

 curved and generally possess a serx-ate margin. The serrations are 

 often so marked, that digitate processes are formed on the free 



