310 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Ctenodonta retrorsa Ulrich. 



Ctenodonta retrorsa Ulrich, Geol. Surv. Ohio, 1893, p. 679, pi. 50, figs. 14, 15. 

 Trenton (Hermitage): Near Burgin, Kentucky. 

 Holotype.C&t. No. 46149, U.S.N.M. 



Ctenodonta sanguinolaroidea (Hall). 



Tellinomya eanguinolaroidea Hall, Pal. New York, 1, 1847, p. 152, pi. 34, figs. 



4a, b. 

 Tellinomya (Ctenodonta) sanguinolaroidea Clarke and Ruedemann, Bull. New 



York State Mus., 65, 1903, p. 521 (gen. ref.). 

 Lyonsia Banguinolaroidea D'Orbigny, Prodr. Pal., 1, 1850, p. 10 (gen. ref.). 



Emmons, Amer. Geology, 1, pt. 2, 1855, p. 170, pi. 14, fig. 2. 

 Trenton: Canajoharie and Middleville, New York. 



Ctenodonta scofleldi Ulrich. 



Ctenodonta scofieldi Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 593, pi. 42, figs. 



53-58. 



Tellinomya scofieldi Miller, N. A. Geol. Pal., 2d App., 1897, p. 785 (gen. ref.). 

 Black River (Decorah): Cannon Falls and Minneapolis, Minnesota. 

 Cotypes. Cat. Nos. 46150, 46151, U.S.N.M. 



Ctenodonta similis (Ulrich). 



Tellinomya similis Ulrich, 19th Ann. Rep. Geol. Nat. Hist. Surv. Minnesota, 



March, 1892, p. 220, fig. 6. 

 Ctenodonta similis Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 604, pi. 42, figs. 



102-106. 

 Tellinomya (Nucula) lepida Sardeson, Bull. Minnesota Acad. Nat. Sci., 3, April, 



1892, p. 339, pi 6, figs. 18-20. 



Richmond: Spring Valley, etc., Minnesota; Blanchester, Ohio. 

 Cotypes and plesiotypes Cat. Nos. 46147, 46152, U.S.N.M. 



Ctenodonta simulatrix Ulrich. 



Ctenodonta simulatrix Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 600, pi. 42, figs. 



74, 75. 



Richmond (Maquoketa) : Near Spring Valley, Minnesota. 

 HolotypeG&t. No. 46153, U.S.N.M. 



Ctenodonta sinuosa (Simpson). 



Nucula sinuosa Simpson, Trans. Amer. Phil. Soc., n. s., 16, 1890, p. 451, fig. 19. 

 Clinton: Seven miles northwest of Lewistown, Pennsylvania. 



Ctenodonta socialis Ulrich. 



Ctenodonta socialis Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 594, pi. 42, figs. 



59, 60. Grabau and Shimer, N. A. Index Fossils, 1, 1909, p. 394, fig. 



502e-f. 



Tellinomya socialis Miller, N. A. Geol. Pal., 2d App., 1897, p. 785 (gen. ref.). 

 Black River (Decorah): Minneapolis, Chatfield, etc., Minnesota. 

 Trenton (Hermitage) : Central Kentucky. 

 Cotypes. Cat. Nos. 46154, 46155, U.S.N.M. 



Ctenodonta subcuneata Ruedemann. 



Ctenodonta subcuneata Ruedemann, Bull. New York State Mus., 162, 1912, 



p. 103, pi. 6, figs. 9, 10. 

 Trenton (Snake Hill), Snake HiU, Saratoga County, New York. 



