414 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE XLL 



Lower Trias, Meekoceras beds, Wood Canyon, nine miles east of Soda 

 Springs, Aspen Mountains, Idaho. 



Page 



Figs. 1-3. Meekoceras (Koninckites) mushbachantmi White 376 



Figs. 4-6. Meekoceras (Gyronites) aplanatum White 373 



