506 



K II Barbour— Medusina Walcotti. 



Fig. 1. Medusina walcotti sp. now x x / 2 . 

 a, apical view, b, oral view showing mouth-cross. 



ful preservation of all specimens exposed in quarry operations 

 at this place, and it is hoped that additional material and data 

 may be secured. 

 Lincoln, July 20, 1914. 



