146 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Buthotrephis succulens 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. Greol. Pal., 1889, p. 110. 

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



(gen. ref.). 

 Trenton: Glens Falls, New York. 



BUTHOTREPHIS SUCCULOSA James. See Buthotrephis succulens. 



Buthotrephis 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, Narrative 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. Genotype: Ambonychia radiata Hall. 



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



also of many American and European Authors. 

 Byssonychia, Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 498; Geol. Surv. 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 acutirostris 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 vicinity. 

 Holotype.Gzt. No. 46095 U.S.N.M. 



Byssonychia alveola ta 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.C&t. No. 46096, U.S.N.M. 



Byssonychia(?) byrnesi Ulrich. 



Byssonychia(?) byrnesi Ulrich, 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. 



