122 U.S. NATIONAL MUSEUM BULLETIN 262 



Rineceras 



digonum ? (Meek and Worthen) 



Gutschick, R. C, and Treckman, J. F., 1957: p. 1150, pi. 143, 

 figs. 6-8. 



Figured specimen 136476 



Rockford Ls. Indiana 



Rizocevas 



? infundibuliforme Foerste 



Foerste, A. F., 1936a: p. 49, 50, pi. 23, fig. 3. 



Holotype 92795 



Gascons Fm. Quebec, Canada 



? pocilliforme Foerste 



Foerste, A. F., 1936a: p. 48, 49, pi. 23, fig. 4. 

 Holotype 92794 



Gascons Fm. Quebec, Canada 



Robsonoceras 



manitouense Ulrich, Foerste, Miller, and Unklesbay 



Ulrich, E. O., et al., 1944: p. 74, pi. 2, figs. 13, 14. 

 Holotype 109504 



Manitou Ls. Colorado 



Rudolf oc eras 



cornu-oryx (Whitfield) 



Ulrich, E. O., et al., 1944: p. 56, pi. 18, figs. 5, 6; pi. 19, figs. 4-6; 

 pi. 20, figs. 6, 7. 

 Hypotypes 33448, 48284 



Cassin Ls. Vermont 



Sactoceras 



depressum Foerste 



Foerste, A. F., 1930b: p. 66, 67, pi. 8, figs. 6a, b. 

 Holotype and paratype 81429, 81429a 



Port Byron Dol. Illinois 



inaii Endo 



Endo, Riuji, 1923: p. 76, 77, pi. 14, fig. 1. 



Holotype 83700 



Ssuyen Fm. Manchuria, China 



