146 BULLETIN 92^ UNITED STATES NATIONAL MUSEUM. 



Buthotrephis succiilens Hall. 



Buthotrephis succulens Hall, Pal. New York, 1, 1847, p. 62, pi. 22, figs. 2a, b.— 



Chamberlin, Geol. Wisconsin, 1, 1883, p. 152, fig. 25. 

 Buthotrephis succulosa James, Jour. Cincinnati Soc. Nat. Hist., 7, 1885, p. 159. 

 Bythotrephis succulens Miller, N. A. Geol. Pal., 1889, p. 110. 

 Licrophycus succulens Billings, Geol. Canada, Geol. Surv. Canada, 1863, p. 937 



(gen. ref.). 

 Trenton: Glens Falls, New York. 



Btjthotrephis succulosa James. See Buthotrephis succulens. 



Buthotrephi-s tenuis (Hall). 



Buthotrephis gracilis Hall, Pal. New York, 1, 1847, p. 62, pi. 21, fig. 1.— Nichol- 

 son, Rep. Pal. Prov. Ontario, pt. 2, 1875, p. 7, fig. 1. — Etheridge, Quart. 

 Jour. Geol. Soc. London, 39, 1878, p. 574.- — Chamberlin, Geol. Wisconsin, 1, 

 1883, p. 152, fig. 26b. 



Buthotrephis conf. gracilis Emerson, NarratiA^e Hall's Second Arctic Exped., 

 U. S. Navy Dep., 1879, p. 575, fig. 1. 



Buthotrephis tenuis Hall, Pal. New York, 2, 1852, p. 18. 



Bythotrephis tenuis Chapman, Proc. Royal Soc. Victoria, 15, new ser., 1903, 

 p. 104, pi. 16, fig. 1. 



Trenton: Jacksonburgh and Middleville, Herkimer County, New York. 



Buthotrephis yukonensis Ami. 



Bythotrephis yukonensis Ami., Canadian Geol. Surv., Summ. Rep. for 1904, 



1905, p. 388. 

 Lower Paleozoic?: Seven miles north Dalton's Post, Unihana River, Yukon 



district, Canada. 



BYSSONYCHIA Ulrich. Genot}T)e: Ambonychia radiata Hall. 



Ambonychia (part) Hall, Pal. New York, 1, 1847, p. 163; 3, 1859, pp. 269 and 523; 



also of many American and Eiu-opean authors. 

 Byssonychia, Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 498; Geol. Smv. Ohio, 



7, 1893, p. 629.— Cumings, 32d Ann. Rep. Dep. Geol. and Nat. Res. Indiana, 



1908, p. 979.— Grabau and Shimer, N. A. Index Fossils, 1, 1909, p. 431.— Dall. 



Zittel-Eastman Textb. Pal., 1900, p. 368; 2d. ed., 1913, p. 445. 



Byssonychia acutlrostris Ulrich. 



Byssonychia acutirostris Ulrich, Geol. Surv. Ohio, 7, 1893, p. 634, pi. 45, figs. 



8, 9; pi. 46, fig. 10. 

 Maysville (Fairmount): Cincinnati, Ohio, and Aacinity. 

 Holotype.— Gat. No. 46095 U.S.N.M. 



Byssonychia alveolata Ulrich. 



Byssonychia alveolata, Ulrich, Geol. Surv. Ohio, 7, 1893, p. 631, pi. 48, figs. 



1-3.— Cumings, 32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, p. 989, 



pi. 42, figs. 7, 7a. 

 Maysville (Corryville): Cincinnati, Ohio; southeastern Indiana. 

 Holotype— Cat. No. 46096, U.S.N.M. 



Byssonychia(?) byrnesi Ulrich. 



Byssonychia(?) byrnesi Ub-ich, Geol. Surv. Ohio, 7, 1893, p. 635, pi. 47, figs. 

 4 and 5.— Grabau and Shimer, N. A. Index Fossils, 1, 1909, p. 431, fig. 563.— 

 Foerste, Jour. Cincinnati Soc. Nat. Hist., 21, 1914, p. 134, pi. 3, fig. 6. 



Trenton (Upper): Covington, Rogers Gap, etc., Kentucky; Tennessee. 



Cotypes.— Cat. No. 46097, U.S.N.M. 



