500 A MONOGRAPH OF THE AUSTRALIAN SPONGES, 



IV. EUSPONGIA IRREGULARIS JaCKSONIA. 



East of Coast of Australia, Port Jackson (Ramsay, von 

 Lendenfeld). 



Bathymetrical Distribution. 

 I. EusPONGiA Irregularis silicata. 

 10 metres (Port Jackson); Shallow water (Chatham Island, Fiji 

 and St. Vincent Gulf). 



II. Euspongia irregularis lutea. 

 Shallow water. 



III. Euspongia irregularis tenuis. 

 Shallow water. 



IV. Euspongia irregularis Jacksonia. 

 10-20 metres. 



69. SPECIES. EUSPONGIA CONIFERA. Nova species. 

 Shape and Size. 

 This species presents the appearance of half a sphere. The 

 lower side with which the sponge is attached is perfectly flat and 

 has a very regular circular contur. The upper side is convex 

 and bears numerous high cones, on the summit of each of 

 which there is a circular osculum. The only specimen mea- 

 sures 180 mm. in breadth and 80 mm. in height. The cones 

 on the upper side all stand vertical and are of the same shape, 

 although different in size. The largest are 25 mm. high and 

 30 mm. wide at the base, the terminal oscula are circular and 

 measure from 6-10 mm. in diameter, 



The shape of this sponge is a most excejitionally regular one. 



