874 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Onchus clintonl Claypole. 



Onchus clintoni Claypole, Geol. Surv. Pennsylvania, Pref . to Eep. 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, %. 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, Palse- 

 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 amator Billings. 



Oncoceras amator 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. 

 HolotypeC&t. No. 28196, U. S.N.M. 



Oncoceras brevicurvatum 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 carverl 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. 





