874 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Onchus clintoni Claypole. 



Onchus clintoni Claypole, Geol. Surv. Pennsylvania, Pref . to Rep. F 2, 1884, p. 12; 

 Quart. Jour. Geol. Soc. London, 41, 1884, p. 61, fig. 6.— Lesley, Geol. Surv. 

 Pennsylvania, Rep. P 4, 1889, p. 495, figs. 

 Cayugan (New Bloomfield): Perry County, Pennsylvania. 



Onchus deweyi Hall. See Ceratiocaris (Phasganocaris?) deweyi. 



Onchus pennsylvanica Claypole. 



Onchus pennsylvanicus Claypole, Geol. Surv. Pennsylvania, Pref. to Rep. F 2, 



1884, p. 12; Quart. Jour. Geol. Soc. London, 41, 1884, p. 61, fig. 5.— Lesley, 



Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 495, figs. 

 Cayugan (New Bloomfield) : Perry County, Pennsylvania. 



ONCOCERAS Hall. Genotype: O. constrictum Hall. 



Oncoceras Hall, Pal. New York, 1, 1847, p. 196.— D'Orbigny, Prodr. de Pal., 1, 

 1849, p. 5. — Woodward, Man. Mollusca, pt. 1, 1851, p. 90. — Saemann, Pala?- 

 ontagraphica, 3, 1852, pp. 157, 162.— Pictet, Traite de Pal., 2d ed., 2, 1854, 

 p. 646.— Emmons, Amer. Geology, 1, pt. 2, 1855, p. 148.— Hall, Rep. Geol. 

 Surv. Wisconsin, 1861, p. 43. — Billings, Cat. Sil. Foss. Anticosti, Geol. Surv. 

 Canada, 1866, p. 86. — Barrande, Syst. Sil. du Centre Boheme, 2, pt. 1, 1867, 

 p. 450.— Hyatt, Proc. Boston Soc. Nat. Hist., 22, 1884, p. 282.— Miller, N. A. 

 Geol. Pal., 1889, p. 445. — Clarke and Ruedemann, Mem. New York State 

 Mus., 5, 1903, p. 94.— Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 

 122.— Hyatt, Zittel-Eastman Textb. Pal., 1900, p. 530; 2d ed., 1913, p. 611. 



Oncoceras abruptum Hall. 



Oncoceras abruptum Hall, Rep. Supt. Geol. Surv. Wisconsin, 1861, p. 44. — Whit- 

 field, Mem. Amer. Mus. Nat. Hist., 1, pt. 2, 1895, p. 68, pi. 10, figs. 1-3. 

 Black River (Platteville) : Platteville and Beloit, Wisconsin. 



Oncoceras alceus Hall. 



Oncoceras alceus Hall, Rep. Sup. Geol. Surv. Wisconsin, 1861, p. 46. — Whitfield, 



Mem. Amer. Mus. Nat. Hist., 1, pt. 2, 1895, p. 70, pi. 9, figs. 23-26. 

 Black River (Platteville) : Beloit, Wisconsin. 



Oncoceras ainator Billings. 



Oncoceras arnator Billings, Cat. Sil. Foss. Anticosti, Geol. Surv. Canada, 1866, 



p. 59. 

 Anticostian (Chicotte): Southwest Point, Anticosti. 



Oncoceras arcticum Schuchert. 



Oncoceras arcticum Schuchert, Proc. U. S. Nat. Mus., 22, 1900, p. 172, pi. 14, 



figs. 4-7. 

 Mohawkian: Head of Frobisher Bay. 

 Holotype.— Cat. No. 28196, TJ. S.N.M. 



Oncoceras brevicurvatnm Whitfield. 



Oncoceras brevicurvatum Whitfield, Ann. Rep. for 1879,Wisconsin, Geol. Surv., 

 1880, p. 59; Geol. Wisconsin, 4, 1882, p. 234, pi. 7, fig. 2 (Cyrtoceras brevi- 

 curvatum on plate). — Chamberlin, Geol. Wisconsin, 1, 1883, p. 159, fig. 



Black River (Platteville): near Beloit, Wisconsin. 



Oncoceras carveri Clarke. 



Oncoceras carveri Clarke, Geol. Minnesota, 3, pt. 2, 1897, p. 801, pi. 58, figs. 7-9. — 



Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 123, fig. 1366. 

 Black River (Platteville): Minneapolis, Minnesota; Rockton, Illinois. 



