KEY TO THE AUSTEALIAN GENEEA. 



245 



f Oscula large and conspicuous. Meshes o£ the 

 j skeleton-net often irregular, over 0-5 millim. 



48 <; wide Chalinopora, p. 84. 



1 



I Oscula not conspicuous. Skeleton-net regular. 



^ Meshes under 0-4 millim. wide Cladochalina, p. 85. 



(47) ribres slender Chalinella, p. 86. 



r Spicules abundant. Oscula conspicuous, but 



I not prominent Chalinissa, p. 86. 



^"^^■^ ^ Spicules abundant. Oscula prominent Pachychalina, p. 88. 



i^ Spicules scarce. Fibres thick Ceraochalina, p. 88. 



f Sponge-lamella under 5 millim. thick. Sur- 

 face smooth Antlieroclialiiia,p.89. 



I Sponge-lamella over 10 millim. thick. Surface 



L irregular Placochalina, p. 90. 



Spicules abundant. Surface smooth, usually 



annulated Phylosiphonia, p. 92. 



(42)^ Spicules abundant. Surface conulated Siplionochaliiia,p.93. 



Spicules very scarce. Surface covered with 

 ^ irregiilar outgrowths Siphonella, p. 97. 



(43) 



With high conuli Hoplochalina, p. 98. 



f Surface smooth 49 



1 Surface covered with small conuli (50) 



r Digitate processes stout, over 8 millim. thick. 



I Meshes of the skeleton-net wide Dactyloclialina,p.99. 



49 -( Digitate processes slender, usually under 5 

 millim. thick. Meshes of the skeleton-net 



L verysmaU Euchalina, p. 101. 



(50) Dendritically ramifying sponges Chalinodendron, ^^^^ 



(45) Pretty soft and compressible sponges Arenochalma, p. 103. 



