BY R. VON LENDENFELD, PH.D. 519 



II. EUSPONGIA CANALICULATA ELASTICA. 



10 metres. 



III. EuSPONGIA CANALICULATA MOLLISSIMA, 



15 metres. 



71. SPECIES. EUSPONGIA SEPTOSA. Ridley. 



EUSPONGIA SEPTOSA. Ridley (1). 

 SPONGIA SEPTOSA. Lamarck (2). 



Shape and Size. 

 Euspongia septosa is attached to two or more stones over which, 

 it forms horizontally expanded lamince which rise into sub-cylindrical 

 lobes 5 to 7 mm., in diameter. 



Colour. 



The surface has a dark grey colour, in spirits ; the interior dull 

 pale brown, subtransparent. Skeleton fibres amber yellow, usually 

 homogenous in appearance throughout. 



Surface. 



The surface is broken up by a number of sharp prominent ridges 

 and points 1 to 3 mm., high ; the intermediate surface is rough. 

 It has somewhat the appearance of a honey comb. 



Canal System 1 

 Skeleton. 

 Main fibres set approximately at right angles to surface, thickness 

 about 0-6 mm. ; primarie connecting fibres approximately vertical 

 to main fibres, about -035 to -053 mm., in thickness, forming with 

 some secundarie connecting fibres rounded-angled meshes, 0*14 

 toO'2l mm., in diameter, between the main fibres which are about 



(1) Stuart 0. Ridley. Spongiida. Report on the Zoological Collection 

 made in the Indo-Pacific Ocean, during the Voyage of H.M.S. Alert, 1881-2. 

 British Museum of Natural History, Catalogue 18S4, p. 381. 



(2) de Lamarck. Sur les Polipiers empatt^s. Annales des Museum. 

 Tom. 20, p. 373, 1813, 



34 



