516 s. GOTO : 



modified from Dödeeleix ['9 G, p. 315], will be found useful for 



identification. 



I. Body pentagonal or roundish. 



A. Poriferous areas separate or more or less continuous; 

 a marginal zone of variable width free from papulae. 

 Non-poriferous areas forming a network l^etween the 

 poriferous areas, or may form patches of variable 

 size in the midst of poriferous areas ; spines or 

 tubercles may occur in them as far as the ventral 

 margin of the body. Ventral surface finely granulated 

 and with coarser pearl-shaped, flattened or rod-shaped 

 granules. Inner adambalacral spines mostly 5 (at most 



a) No spines in poriferous areas. The coarse granules 

 of the ventral side forming separate groups corres- 

 ponding to the ventral plates, with fine granulation 

 between : 



1. C. schmiddiana Retzius. 

 « ) Poriferous areas small, roundish, separated by 

 non-poriferous areas ; dorsal tubercles rather 

 small, numerous, spiniform : 



var. ccylonica (Ceylon). 

 ß ) Poriferous areas large, more or less continuous; 

 dorsal tubercles very large, wart-like, seldom 

 spiniform, numerous or very few : 



var. africana (East Africa, 



Mauritius, Seychelles). 

 h ) Dorsal tubercles all spiniform. Poriferous areas 

 with spines, which are mostly smaller than those 



