CHALINODENDEON. — ARENOCHALINA. 103 



Chalinodendron dendrilla, Lendenfeld. 



Chalinodendron dendrilla, E. v. Lendeufeld, " Die Chalineen des australiscben 

 Gebietes," Zoologische Jahrbiicher (Spengel), Band ii. Seite 820 (1887). 



Branched, erect sponges, extending in one plane, whicli attain a height of 

 120 millim. The digitate processes are compressed, 10 millim. thick and 15 

 millim. broad. The surface is peculiarly porous. The oscula are 0*8 millim. 

 wide, abundant and scattered. 



The skeleton consists of a network M^ith meshes 0'34 millim. wide and fibres 

 0-016-0-13 millim. thick. The sjncules are strongyla, 0-13 milhm. long and 

 0-006 millim. thick, fairly abundant in the fibres. Exceedingly fine strongyla, 

 0-13 millim. long and only 0*001 millim. thick, are observed in the ground- 

 substance. 



Geogeaphical Distribution. — East coast of Australia : Port Jackson, 

 N. S. W. (Lendenfeld). 



Group ARENOCHALININ-ffi. 



Chalininse with foreign bodies in the main and spicules in the 

 connecting-fibres. 



Genus ARENOCHALINA. 



Digitate Arenochalininse, with foreign bodies in the main and 

 proper spicules in the connecting-fibres, 



Arenochalina mirabilis, Lendenfeld. 



Arenocludina mirabiUs, R. v. Lendenfeld, " Die Chalineen des australischen 

 Gebietes," Zoologische Jahrbiicher (Spengel), Baud ii. Seite 821 (1887). 



Small branched sponges, with compressed branches 12 millim. broad and 

 8 millim. thick. 



The skeleton consists of a network of fibres, with irregularly rectangular 

 meshes 0- 4-0-8 millim. wide. The main fibres are charged with sand ; the 

 connecting-fibres are entirely filled with dense masses of spicules. The main 

 fibres are knotty, 0*05 millim. thick ; the connecting-fibres are perpendicular 

 to the main fibres and about half as thick. The spicules are oxea, 0-02 millim. 

 long and 0-004 millim. thick. 



Geographical Distribution. — North coast of Australia: Torres Straits 

 {Macleay). 



