THE SPONGES OF THE WEST-CENTRAL PACIFIC 261 



sagittal triradiates have their clads in the cloacal lining, their rhabds in the 

 chamber layer. The clads are 7 /x by 150 ll and the rhabds are 9 n by 300 //,. 

 There are tetraxons, with clads about 14 [x by 200 /* tangentally placed in the 

 cloacal lining, and rhabds of similar size protruding into the lumen. 



This species was described as Sycon plumosum by Tanita, 1943, page 

 404. He compares its shape to that of Scypha ramsayi (Lendenfeld) and its 

 spicules to those of Scypha australis (Jenkin). 



