30 U.S. NATIONAL MUSEUM BULLETIN 262 



Centrocyrtoceras 



americanum (D'Orbigny) 



Foerste, A. F., 1933: p. 53 



Hypotypes 59429 



Black River Fm. New York 



annulatus (Hall) 



Butts, Charles, 1942: p. 100, pi. 92, fig. 25. 

 Hypotype 97495 



Lowville Ls. Virginia 



bondi (Safford) 



Foerste, A. F., 1932, 1933: p. 49-51 (1933); pi. 28, fig. 1 (1932). 

 Hypotype 87117 



Stones River Div., 

 Murfreesboro Mbr. Tennessee 



duplicostatum (Whitfield) 



Foerste, A. F., 1926: p. 366, 367, pi. 43, fig. 5. 

 Hypotype 70827 



Black River Ls., Platteville Mbr. Wisconsin 



filosum Foerste 



Foerste, A. F., 1932, 1933: p. 53 (1933), pi. 28, figs. 11a, b (1932). 

 Holotype 87036 



Stones River Div., Ridley Mbr. Tennessee 



? percinctum Foerste 



Foerste, A. F., 1932, 1933: p. 48, 49 (1933), pi. 28, figs. 9a, b (1932). 

 Holotype and paratypes 48407 



Stones River Div., 

 Murfreesboro Mbr. Tennessee 



relaxum Foerste 



Foerste, A. F., 1932, 1933: p. 47, 48 (1933), pi. 28, fig. 4 (1932). 

 Holotype 48409 



Stones River Div., 

 Murfreesboro Mbr. Tennessee 



ridleyense Foerste 



Foerste, A. F., 1932, 1933: p. 51, 52 (1933), pi. 28, figs. 5a-d (1932). 

 Holotype and paratypes 48408 



Ridley Ls. Tennessee 



rotundum Foerste 



Foerste, A. F., 1935: p. 27, 28, pi. 10, fig. 6. 

 Holotype 90906 



Prosser Fm. Iowa 



