Volume 50 



Jillson, Villard R. 



1947 A cephalopod from the Uppermost Qrdovioian of northern 



Kentucky. 1 



Johnston, Francis N, 



1941 Trias at New Pass, Nevada, (New Lover Karnic ammonoids). 2 



Jones, David L. 



1961 Muscle attachment impressions in a Cretaceous ammonite* 3 



1963 Upper Cretaceous (Companion and Maestri cat! an) ammonites 



from southern Alaska* 4 



Joysey, Kenneth A. 



1961 Life and its environment in ancient seas. 5 



