86 CLADOOHALINA. — CHALIN18SA. 



on an average 2 millim. wide and 8 millim. apart. Skeleton-net with meshes 

 0*4 miUim. wide and fibres 0-06 millim. thick. Sjncules : oxea, curved, 0-07 

 millim. long and 0*002 millim. thick. 



Geographical Disteibtjtion. — East coast of Australia : Port Jackson, 

 N. S. W. (Ramsay). 



Cladochalina mollis, Lendenfeld. 



Cladochalina mollis, E. v. Lendenfeld, " Die Chalineen des australischen Ge- 

 bietes," Zoologische Jahrbiicher (Spengel), Band ii. Seite 7G8 (1887). 



Massive forms with mammiform protuberances, at the ends of which the 

 email oscula are situated. The sponge attains a greatest breadth of 200 millim. 

 and a height of 50 millim. Slceleton-net with meshes, on an average, 0*35 

 millim. wide and fibres 0'06 millim. thick. Spicules : oxea, curved, 0*077 miUim. 

 long and 0*0017 millim. thick, numerous. 



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

 N. S.W. (Lendenfeld). 



Genus CHALINELLA. 

 Cacochalininge with very fine fibres ; spicules scarce and small. 



Chalinella tenella, Lendenfeld. 



Chalinella tenella, R. v. Lendenfeld, " Die Chalineen des australischen Gebietes," 

 Zoologische Jahrbiicher (Spengel), Band ii. Seite 770 (1887). 



Small, massive, horizontally expanded, tender sponges, with oscula 1*5 millim. 

 wide. Skeleton-net with meshes 0*2 millim. wide and fibres 0*013 millim. 

 thick. Spicules : oxea, 0*033 millim. long and 0*0009 millim. thick. 



Geographical Distribution. — South coast of Australia : Port Phillip, V. 

 (Lendenfeld). 



Group PACHYCHALININiE. 



Hard, regularly digitate, or lamellar Clialininse, with very thick 

 fibres. 



Genus CHALINISSA. 



Hard, digitate, lamellar Pachychahninae, with smooth undulating 

 surface, which is strengthened by a dense special surface-skeleton. 



