86 



Notes on other species of RHOPALODIA. 



kOa Valves with lateral keel extending along both margins of 



each valve hi 



kOb Valves with lateral keel extending along one margin of 



each valve b-2 



Ij-la Valve face longitudinally undulate, undulations conspicuous 

 in girdle view; with "broad, short, peripheral costae; longi- 

 tudinal pseudoraphe present - CTMATO PLEURA 



Fig. 136. Cymatopleura s olea , (5), cells 30-300u long, 12-i+0u 

 wide. X 750. 



valve view 



girdle view 



Notes 



