570 STUDIES ON SPONGES, 



Thickness of digitate processes 8 mm., length 600 mm. The 

 whole sponge hard and elastic. 



Locality : East Coast of Australia, Illawarra. 

 This species is represented in fig. 19. 



CHALINOPSIS DICHOTOMA. Nov spec. 



Digitate processes cylindrical of not very uniform diameter, 

 repeatedly branched in a dichotomous manner. The whole sponge 

 attached by a thin stem. 



Oscula large and very numerous. Digitate processes 1 2 mm. 

 thick, tending to extend in one plain, particularly at the points of 

 ramification. Irregular digitate and conic processes on the surface. 

 Sponge 400 mm. long. 



Locality : West Coast of Australia, Western Austi-alia. 



This sponge is represented in fig. 21. 



GENUS. DACTYLOCHALINA. 



Sponges belonging to the Monactinellse. Skeleton composed of 

 a hexactinellid network of horny fibres. Meshes i)retty small. 

 An extremely fine network of slender threads with very small 

 meshes on the surface. 



Very small and slender spicules ac. ac. straight or slightly 

 curved are found in the axis of the horny fibres. These spicules 

 are not numerous. They are more scarce in the connecting than 

 in the main fibi-es. They are found also in the fibres of the fine 

 surface-net. 



Sponges with digitate processes. 



DACTYLOCHALINA CYLINDRICA. NoV SpeC. 



Digitate processes neai-ly straight, slightly branched, growing in 

 a penicillate manner parallel from the expanding branches at the 

 base. They coalesce here and there, where they accidentally touch. 

 They are slightly undulating, regularly cylindrical and 7 nun. 

 thick. They terminate with rounded ends. Oscula small, 

 common stem short and thick. Length of sponge 500 mm. 



