148 BULLETIISr 92, UNITED STATES NATIONAL MUSEUM. 



Byssonychia radiata (Hall). 



Ambonychia radiata Hall, Pat. New York, 1, 1847, p. 292, pi. 80, figs. 4a-l.— 

 Billings, Canadian Nar. Geol., 1, 1856, p. 44, fig. 7.— Hall, 12th Rep. New 

 York State Cab. Nat. Hist., 1859, p. 8, fig.; p. 110, figs. 1, 2.— Lincklaen. 

 14th Rep. New York State Cab. Nat. Hist., 1861, pi. 4, fig. 7.— Hall, Pal. 

 New York, 3, 1861, p. 269, fig.; p. 523, figs. 1, 2.— Chapman, Canadian Jour., 

 n. 8., 7, 1862, p. 166, fig. 110; ibid., 8, 1863, p. 206, fig. 205.— Hall, Rep. Geol. 

 Surv. Wisconsin, 1862, p. 54, figs. 1, 2. — Billings, Geol. Canada, Geol. Surv. 

 Canada, 1863, p. 215, fig. 219.— Chapman, Expos. Min. Geol. Canada, 1864, 

 p. 120, fig. 110; p. 178, fig. 205.— Miller, Cincinnati Quart. Jour. Sci., 1, 1874, 

 pp. 14, 15.— Nicholson, Rep. Pal. Prov. Ontario, pt. 2, 1875, p. 35, fig. 11.— 

 Hall and ^Vhitfield, Geol. Surv. Ohio, Pal., 2, 1875, p. 79, pi. 2, fig. 2.— 

 Roemer, Leth. geog., 1, Leth. Pal., Atlas, 1876, pi. 4, fig. 17.— Zittel, Handb. 

 Pal., 2, 1881, p. 35, fig. 42b.— Chamberlin, Geol. Wisconsin, 1, 1883, p. 174, 

 fig.— Miller, N. A. Geol. Pal., 1889, p. 461, fig. 771.— Lesley, Geol. Pennsyl- 

 vania, Rep. P 4, 1889, p. 23, figs. 



Byssonychia radiata Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 477, fig. 35VI. — 

 Cumings, 32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, p. 993, pi. 43, 

 fig. 4.— Grabau and Shimer, N. A. Index Fossils, 1, 1909, p. 432, fig. 562c, 

 566.— Bassler, Bull. Geol. Surv. Virginia, 2a, 1909, pi. 14, fig. 7.— Foerste, 

 Bull. Sci. Lab. Denison Univ., 17, 1914, p. 273, pi. 3, figs. 12a-c. 



Mays\'ille-Pdchmond : Turin, Lorraine, Pulaski, etc.. New York, and Quebec 

 (Pulaski); Ohio; Indiana; Kentucky; Virginia; Tennessee (Maysville and 

 Richmond); Anticosti, etc., Canada. 



Plesiotype— Cat. No. 46105, U.S.N.M. (Uhrich). 



Byssonychia retrorsa (Miller). 



Ambonychia retrorsa Miller, Jour. Cincinnati Soc. Nat. Hist., 1, 1878, p. 104, pi. 



3, fig. 6. 

 Byssonychia retrorsa Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 499 (gen. ref.). 

 Maysville (Fairmount) : Cincinnati, Ohio. 



Byssonychia richmondensis Ulrich. 



Ambonychia robusta Miller (part). Jour. Cincinnati Soc. Nat. Hist., 3, 1880, p. 



315. 

 Byssonychia richmondensis Ulrich, Geol. Surv. Ohio, 7, 1893, p. 632, pi. 45, 



figs. 3, 4. — Cumings, 32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, p. 



994, pi. 44, figs. 2-2a. 

 Richmond ("^Tiitewater) : Richmond, etc., Indiana. 

 Holotype— Cat. No. 46106, U.S.N.M. 



Byssonychia robusta (Miller). 



Ambonychia robusta Miller, Jour. Cincinnati Soc. Nat. Hist., 3, 1881, p. 315, pi. 



g, figs. 3, 3a. 

 Byssonychia robusta Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 499 (gen. ref.). 

 Richmond (Whitewater): Osgood, Indiana. 



Byssonychia suberecta Ulrich. 



Byssonychia suberecta Ulrich, Geol. Surv. Ohio, 7, 1893, p. 634, pi. 45, figs. 13- 



15.— Cumings, 32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, p. 995, 



pi. 44, figs. 3-3b. 

 Richmond (Waynesville) : Waynes\'ille, Ohio; Versailles, Indiana. 

 Coty pes. —Cat. No. 46107, U.S.N.M. 



Byssonychia tennistriata Ulrich. 



Byssonychia tenuistriata Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 500, fig. 39. — 

 Cumings, 32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, p. 996, pi. 43, 

 figs. 5, 5a. 



