BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 31 



Ambonychia orbicularis Continued. 



Posidonomya orbicularis Emmons, Amer. Geol., 1, pt. 2, 1855, p. 176, pi. 13, 



figs. 18, 19. 

 Ambonychia orbicularis Hall, Pal. New York, 1, 1847, p. 164, pi. 36, tigs. 5a-d. 



Emmons, Man. Geol., 1860, p. 99, fig. 88. Lesley, Geol. Surv. Pennsylvania, 



Rep. P 4, 1889, p. 22, fig. 

 Trenton: Watertown and Middleville, New York. 



AMBONYCHIA PERANGULATA Miller. See Psilonychia perangulata. 



Ambonychia planistriata Hall. 



Ambonychia planistriata Hall, Rep. Geol. Surv. Wisconsin, 1861, p. 32. Ulrich 



Geol. Minnesota, 3, pt. 2, 1894, p. 491, pi. 35, figs. 3 and 4. Whitfield, Mem. 



Amer. Mus. Nat. Hist., 1, pt. 2, 1895, p. 58, pi. 7, figs. 3, 4. 

 Black River (Platteville): Mineral Point and Beloit, Wisconsin; Cannon Falls, 



Minnesota; Lee County, Illinois. 

 Plesiotype. Cat. No. 46086, U.S.N.M. 



AMBONYCHIA RADIATA of authors. See Byssonychia radiata. 



AMKONYCHIA RAUCHI McChesney. 



Ambonychia Rauchi McChesney, Desc. New Fossils, 1860, p. ,S9. 

 M;iysville or Richmond: Madison, Indiana. 



Observation. Probably refers to some species of Byssonchia, but description 

 is too poor for identification. 



AM BONYCHIA RETRORSA Miller. See Byssonychia retrorsa. 



AMBONYCHIA ROBUSTA Miller. See Byssonychia robusta and B. richmondensis. 



Ambonychia septentrionalis Whiteaves. 



Ambonychia septentrionalis Whiteaves, Geol. Surv. Canada, Ann. Rep. (n. s.), 

 14, App. F, 1904, p. 46; Geol. Surv. Canada, Pal. Foss., 3, pt. 4, 1906, p. 255, 

 pi. 28, fig. 5. 

 Niagaran: Ekwan River, Canada. 



AMUONYCHIA STRLECOSTA McChesney. See Pterinea strisecosta. 

 AMBONYCHIA SUBUNDATA Miller. See Clionychia subundata. 

 AMBONYCHIA SUPERBA Billings. See Clionychia superba. 



AMBONYCHIA SWANANA Safford. 



Ambonychia Swanana Safford, Geol. Tennessee, 1869, p. 287 (nom. nud.). 

 Upper Nashville: Central Tennessee. 



AMBONYCHIA TENUISTRIATA Miller. See Byssonychia tenuistriata. 

 AMBONYCHIA UNDATA Hall. See Clionychia undata. 



Ambonychia undulata (Whitfield). 



Leptodomus undulatus Whitfield, Ann. Rep. Wisconsin Geol. Surv. for 1877, 



1878, p. 81; Geol. Wisconsin, 4, 1882, p. 293, pi. 18, figs. 1, 2. 

 Ambonychia undulata Whiteaves, Ann. Rep. Geol. Surv. Canada (n. s.), 14, 



App. F, 1904, p. 46; Geol. Surv. Canada, Pal. Foss., 3, pt. 4, 1906, p. 254, 



pi. 28, fig. 4. 

 Niagaran: Wauwatosa, Wisconsin (Racine); Ekwan River, Canada. 



