360 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Cyrtodonta billings! Ulrich. 



Cypricardites ventricosus Whitfield (not Hall), Geol. Winconsin, 4, 1882, p. 209, 



pi. 5, fig. 9. 

 Cyrtondonta billingsi Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 538, pi. 40, 



figs. 2-6. Weller, Geol. Surv. New Jersey, Pal., 3, 1903, p. 166, pi. 11, fig. 7. 



Grabau and Shinier, N. A. Index Fossils, 1, 1909, p. 409, figs. 528d, e. 

 Black River: Dunleith, Illinois; Beloit, Mineral Point, etc., Wisconsin; Cannon 



Falls, etc., Minnesota (Platteville); Lincoln County, Missouri (Decorah); 



New Jersey (Jacksonburg). 

 Cotypes. Cat. Nos. 46174, 46175, U.S.N.M. 



Cyrtodonta breviuscula Billings. 



Cyrtodonta breviuscula Billings, Canadian Nat. Geol., 4, 1859, p. 446. Whiteaves, 



Ottawa, Nat., 22, 1908, p. 107, pi. 3, fig. 3. 



Cypricardites breviuscula Miller, N. A. Geol. Pal., 1889, p. 476 (gen. ref.). 

 Stones River (Pamelia): Near Ottawa, Ontario. 



Cyrtodonta canadensis Billings. 



Cyrtodonta Canadensis Billings, Canadian Nat. Geol., 3, 1858, p. 434, figs. 8-11; 



Geol. Surv. Canada, Rep. Progr. for 1857, 1858, p. 182, figs. 8-10; p. 183, fig. 



11; Geol. Canada, Geol. Surv. Canada, 1863, p. 148, fig. 106. Whiteaves, Pal. 



Foss., Geol. Surv. Canada, 3, pt. 3, 1897, p. 241. Weller, Geol. Surv. New 



Jersey, Pal., 3, 1903, p. 167, pi. 11, fig. 3. 



Cypricardites canadensis Miller, N. A. Geol. Pal., 1889, p. 476 (gen. ref.). 

 Black River: St. Josephs Island, La Petite Chaudiere Rapids, Pauquettes 



Rapids, and Lake Winnipeg, Canada; New Jersey. 



CYRTODONTA CANADENSIS Grabau and Shimer. See Megalomus canadensis. 



Cyrtodonta cingulata (Ulrich). 



Cypricardites cingulata Ulrich, 19th Ann. Rep. Geol. and Nat. Hist. Surv. Min- 

 nesota, 1892, p. 235, fig. 21. 



Cyrtodonta cingulata Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 545, pi. 40, figs. 7, 8. 

 Black River (Decorah): Minneapolis, Minnesota. 

 Holotype.C&t. No. 46176, U.S.N.M. 



Cyrtodonta clochensis Foerste. 



Cyrtodonta clochensis Foerste, Bull. Sci. Lab. Denison Univ., 17, 1914, p. 297, 



pi. 2, figs. 6a-b. 

 Black River (Lowville): La Cloche Peninsula, Ontario. 



CYRTODONTA CORDIFORMIS Billings. See Plethocardia? cordiformis. 



Cyrtodonta cuneata (Miller). 



Angellum cuneatum Miller, Jour. Cincinnati Soc. Nat. Hist., ], 1878, p. 106, pi. 



3, fig. 11; N. A. Geol. Pal., 1889, p. 462, fig. 774. 

 Cyrtodonta cuneata Cumings, 32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, 



p. 999, pi. 45, fig. 2. 

 Richmond (Whitewater): Richmond, Indiana. 



Cyrtodonta descriptus (Sardeson). 



Cypricardites descriptus Sardeson, Bull. Minnesota Acad. Nat. Sci., 4, 1896, p. 70, 



pi. 2, fig. 2. 

 St. Peter: Highland Park, Minnesota. 



Cyrtodonta dignus (Sardeson). 



Cypricardites dignus Sardeson, Bull. Minnesota Acad. Nat. Sci., 4, 1896, p. 71, 



pi. 2, figs. 4, 5. 

 St. Peter: South St. Paul, Minnesota. 





