PLATE 3 

 Pterinopecten cf. proteus Clarke and wulfi Freeh 



Page 26 



i A small left valve 



Pterinea cf. pseudolaevis Oehlert 



Page 



2, 3 Left valves with suppressed anterior wing and suberect form 



Pterinea sp. 



4 A right valve whose specihe relations are not clear 



Pterinea brisa var. vexillum Clarke 



Page 28 



5, 6 Right and left valves 



Pterinopecten denysi Clarke 



Page 25 



7 The left valve described 



Pterinea intercostata Clarke 



Page 2^ 



8-12 A series of illustrations showing the variations to which this shell 

 is subject 



Pterinea (Pteronitella?) incurvata Clarke 



Pa S e *S 



13-18 Illustrations of both valves 



172 



