364 BULLETIN 02, UNITED STATES NATIONAL MUSEUM, 



CYRTODOXTA? PLEBEIA Billings. See Whitella plebeia. 



Cyrtodonta ponderosa Billings. 



Cyrtodonta ponderosa Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 150 



(adv. sheets, 1862). 



Cypricardites ponderosa Miller, N. A. Geol. Pal., 1889, p. 477 (gen. ref.). 

 Richmond: Cape Smyth, Manitoulin Island, Lake Huron. 



Cyrtodonta rotulata Ulrich. 



Cyrtodonta rotulata Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 541, pi. 39, figs. 

 16-19. 



Black River: Mercer County, Kentucky; Minneapolis and near Fountain, Min- 

 nesota (Decorah). 



Cotypes Cat. Nos. 46190, 46855, U.S.N.M. 



Cyrtodonta rugosa Billings. 



Cyrtodonta rugosa Billings, Canadian Nat. Geol., 3, 1858, p. 432, figs. 1, 2; Geol. 



Surv. Canada, Rep. Progr. for 1857, 1858, p. 179, figs. 1, 2; Geol. Canada, 



Geol. Surv. Canada, 1863, p. 148, fig. 104a, b. 



Cypricardites rugosus Miller, N. A. Geol. Pal., 1889, p. 477 (gen. ref.). 

 Black River: Near Ottawa, Ontario. 



Cyrtodonta saffordi (Hall). 



Palsearca saffordi Hall, Pal. New York, 3, 1859, p. 271, figs. 4, 5; 12th Rep. New 



York State Cab. Nat. Hist., 1859, p. 11, figs. 4, 5, 



Cyrtodonta Saffordi Safford, Geol. Tennessee, 1869, p. 287, pi. 2 (F), figs. 2a-g. 

 Cypricardites saffordi Hall and Whitfield, Geol. Surv. Ohio, 2, 1875, p. 177, (gen. 



ref.). Lesley, Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 179, figs. 

 Trenton (Catheys): Nashville, etc., Tennessee. 

 Ple#iotype.Cat. No. 46191, U.S.N.M. 



Cyrtodonta scala Raymond. 



Cyrtodonta scala Raymond, Annals Carnegie Mus., 3, 1906, p. 578. 

 Chazyan (Crown Point): Valcour Island, New York. 



CYRTODOXTA SIGMOIDEA Billings. See Whitella? sigmqidea. 



Cyrtodonta sillimanensis Ulrich. 



Cyrtodonta sillimanensis Ulrich, Proc. U. S. Nat. Mus., 22, 1900, p. 162, pi. 13, 



figs. 31-33. 



Mohawkian: Head of Frobisher Bay, Baffin Land. 

 Cotypes. Cat. No. 28159, U.S.N.M. 



Cyrtodonta solitaria Raymond. 



Cyrtodonta solitaria Raymond, Amer. Jour. Sci., 20, 1905, p. 373. 

 Chazyan (Crown Point): Near Tracy Brook. Chazy, New York. 



Cyrtodonta splnifera Billings. 



Cyrtodonta spinifera Billings, Canadian Nat. Geol. ,3, 1858, p. 435, fig. 12; Geol. 



Surv. Canada, Rep. Progr. for 1857, 1858, p. 183, fig. 12. 

 Cypricardites spinifera Miller. N. A. Geol. Pal., 1889, p. 477 (gen. ref.). 

 Black River (Leray): Pauquette Rapids, and Fourth Chute of Bonnechere, 



Canada. 



Cyrtodonta subangulata (Hall). 



Edmondia? subangulata Hall, Pal. New York, 1, 1847, p. 156, pi. 35, fig. 2a, b. 

 Palaearca subangulata Hall, 12th Rep. New York State Cab. Nat. Hist., 1859, p. 

 68 (gen. ref.). 



