46 U.S. NATIONAL MUSEUM BULLETIN 262 



Cyrtoceras 



baffinensis Schuchert 



Schuchert, Charles, 1900: p. 171, pi. 14, figs. 11-13. 



Holotype 28198 



Trenton Baffin Land, Canada 



cambria Walcott 



Walcott, C. D., 1905: p. 22. 



Syntypes 57821; 109614-109617 



Chaumitien Ls. Shantung, China 



Kobayashi, Teiichi, 1935: p. 19, 20. 

 Lectotype (of Plectronoceras 



cambria) 57819 



Chaumitien Ls. Shantung, China 



cessator Hall and Whitfield 



Hall, James, and Whitfield, R. P., 1877: p. 278, pi. 6, fig. 15. 

 Holotype (not located) 14178 



Lower Carboniferous Nevada 



cinctutus Foerste 



Foerste, A. F., 1909: p. 61, 62, pi. 3, figs. 3a, b. 

 Syntypes 87011 



Osgood Bd. Tennessee 



Foerste, A. F., 1930b: p. 60-62, pi. 25, fig. 7. 

 Lectotype and paratypes (of Lechritro- 



choceras ? cinctutum) 87011 



Osgood Mbr. Tennessee 



clintonense Foerste 



Foerste, A. F., 1893b: p. 534, pi. 36, figs. 2a-e. 

 Syntype 88650 



Clinton Gr., "Brassfield Beds" 



(on label) Ohio 



Syntype 111749 



Clinton Gr., "Big Horn Ls." 

 (on label) "Browns Quarry" 



(Ohio ?) 



cornulum Schuchert 



Schuchert, Charles, 1900: p. 170, 171, pi. 14, figs. 8-10. 



Holotype and paratypes 28121 



Trenton Baffin Island, Canada 



dactyloides Dwight 



Dwight, W. B., 1894: p. 255, 256, pi. 7, figs. 9, 9a. 

 Holotype 109453 



Calciferous Ledge D New York 



