REVISION OF AFRICAN SPECIES OF CLEORA 



15 



41 (40) Minute membranous apical process on sacculus at two-thirds ventral margin of 



valve ; one or more setose digitate processes at mid-valve (Text-fig. 112) 



serena (p. 84) 

 Valve slightly narrowed at two-thirds ventral margin, but no apical process 

 developed on sacculus ; two or more minute digitate processes at mid-valve ; 

 cucullus with 4-8 tubercle-like projections from dorsal margin towards mid- 

 valve (Text-fig. 109) ; endemic on Comoro Is. . . angustivalvis (p. 82) 



42 (36) Longer of two cornuti smooth and without spines ; shorter cornutus tipped 



with a cluster of spines or edged with a few spines .... 43 



Longer of two cornuti scobinate on one surface from one-half to seven-eighths, 

 apical eighth smoothly tapered ; shorter cornutus smooth or partially 

 scobinate .......... 44 



LAMELLA POSTVAGINALIS 



LAMELLA ANTEVAGINALIS 



RIBBING 



STERIGMA 



COLLICULUM 



BURSA COPULATRIX 



