JAPANESE ASTEKOroEA. 517 



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of the non-poriferous areas. The coarse granules 

 of the ventral side may be segregated into groups 

 by intervening tine granulation : 



2. C. novœ-cjuineœ M.T. 

 a ) Poriferous areas small, roundish, separated 

 by well developed network of non -poriferous 

 areas : 



var. plana (Sumatra to Samoa). 

 ß ) Poriferous areas large, 3-6 -sided, continued 

 into one another, separated by rows of larger 

 spines and non-poriferous patches : 



var. typlca (Amboina to Samoa). 

 y ) Poriferous areas indistinctly separated into 

 patches, uniformly covered with numerous small 

 spines, with smaller non-poriferous patches be- 

 tween with few coarse spines : 



var. arenosa (Amboina to 



Sandwich Islands). 

 o ) Poriferous areas continuous, with small non- 

 poriferous patches between ; dorsal side uniform- 

 ly covered with numerous coarse spines : 



var. acutisplnosa (New 

 Hebrides, Viti Islands). 

 c ) Poriferous areas covered with small spines, small, 

 round, entirely separated from one another by a 

 continuous network of wide non-poriferous are- 

 as free from spines. Coarse granulation of the 

 ventral side very weakly developed: 



3. C. grex M.T. 



