[ 14 ] 



Figs. 65-75. /. inconstans Woods : 65-68, 71-73, Holaster-planus Zone ; 69 & 70, 

 Actinocamax-quadratus Zone ; 74 & 75, Upper Clalk ; 65, 69, right 

 valves ; 67, 71, 74, left valves ; 66, 68, 70, anterior views ; 72, dorsal 

 view of 71 ; 75, dorsal view of 74. All (5) half of the natural size. 



