[ 15] 



Figs. 76-81. I. inco7ist an s Woods, Actinocamacc-quadratus Zone : 76, left valve; 

 77, dorsal view of 76 ; 78, anterior; 79-81, inflated form connecting 

 /. inconstans with /. inconstmis var. sarumensis ; 79, left valve ; 

 80, dorsal view of 79 ; 81, anterior. 82 & 83. /. inconstans var. saru- 

 mensis Woods, Actinocamax-quadratus Zone : 82, right valve ; 83, 

 dorsal. 84 & 85. /. inconstans var. striatus Mant., Holaster-planus 

 Zone : 84, right valve ; 85, posterior. All @ half of the natural size. 



