University of MicJiigan 



Plate I 



Figs. I, 2, 3: OrcohcUx idahocnsis bailcyi Bartsch. Most depressed 

 specimen. Index 56.91. 



Figs. 4, 5, 6: OrcohcUx idahocnsis bailcyi Bartsch. Most elevated 

 specimen. Index 84.34. 



All figures enlarged 3 times. 



