Catalog Number: CG-0026
First described by G. H. Girty in 1912 as found in Oklahoma. This specimen was 3/4 exposed as attached to a rock. I am not positive, but I believe it would break into more than one piece if I attempted to remove it. I am always finding either Pseudorthoceras or Metacoceras specimens. It could be a Mooreoceras, but the small size makes me consider otherwise.
Magnified view of the septal neck. 
Septal neck. in center. 
Cross section showing oval shape and septal neck. 
8 septal chambers remain on this small specimen.
References
- G. H. Girty, 1912, some new genera and species of Pennsylvanian fossils from the Wewoka Formation of Oklahoma. Annals of the New York Academy of Sciences 21(2) : Pages 119-156