BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 875 



Oncoceras constrictum Billings. See Poterioceras apertum. 



Oucoceras coustrictuni Hall. 



Oncoceras constrictum Hall, Pal. New York, 1, 1847, p. 197, pi. 41, figs. 6a-f, 7a-d; 

 3d Rep. New York State Cab. Nat. Hist., rev. ed., 1850, p. 180, pi. 3, fig. 3, 

 doc. ed., p. 172. — Emmons, Amer. Geol., 1, pt. 2, 1855, p. 148, pi. 12, 

 fig. 2— Miller, N. A. Geol. Pal., 1889, p. 445, fig. 748.— Lesley, Geol. Surv. 

 Pennsylvania, Rep. P 4, 1889, p. 494, fig. 



Phragmoeeras constrictum Chapman, Expos. Min., Geol. Canada, 1864, p. 131, 

 fig. 134. 



Poterioceras constrictum Foord, Cat. Foss. Ceph. British Mus., 1, 1888, p. 258. 



Cyrtoceras constrictum Billings, Geol. Canada, Geol. Surv. Canada, 1863, p. 951 

 (gen. ref.). 



Trenton: Middleville, Watertown, and Trenton Falls, New York. 

 Observation. — See Nelimenia incognita Castelnau. 



Oncoceras douglassi Clarke. 



Oncoceras douglassi Clarke, Geol. Minnesota, 3, pt. 2, 1897, p. 801, pi. 60, figa. 



13-15. 

 Trenton (Prosser): Hader, Goodhue County, Minnesota. 



Oncoceras exiguum (Billings). 



Cyrtoceras exiguum Billings, Can. Nat. Geol., 5, 1860, p. 172, figa. 17-18; Geol. 



Canada, Geol. Surv. Canada, 1863, p. 150, fig. 109. 

 Clinoceras exiguum Schuchert, Proc. U. S. Nat. Mus., 22, 1900, p. 171. 

 Oncoceras exiguum Clarke, Geol. Minnesota, 3, pt. 2, 1S97, p. 798, pi. 58, figs. 10, 



11.— Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 124, fig. 1368. 

 Trenton: Near L'Original, Canada; Fountain, Minnesota; Baffin Land. 



Oncoceras expansum Hall. 



Oncoceras expansum Hall, Pal. New York, 2, 1852, 2, p. 337, pi. 77A, figs. 2a, b. 

 Cayugan (Cobleskill): Schoharie, New York. 



Oncoceras fragile (Billings). 



Cyrtoceras fragile Billings, Cat. Sil. Foss. Anticosti, Geol. Surv. Canada, 1866, 



p. 59. 

 Gamachian (Ellis Bay): Gamache Bay, Anticosti. 



Oncoceras futile Billings. 



Oncoceras futile Billings, Cat. Sil. Foss. Anticosti, Geol. Surv. Canada, 1866, p. 59. 

 Anticostian (Jupiter River): East of Jupiter River, Anticosti. 



Oncoceras gibbosuin Hall. 



Oncoceras gibbosum Hall, Pal. New York, 2, 1852, p. 13, pi. 4 (bis.), figs. 6a, b, c. 

 Upper Medinan: Lockport, New York. 



Oncoceras gibbosum Whiteaves. See Oncoceras whiteavesi. 



Oncoceras huronense (Billings). 



Cyrtoceras Huronense Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 176, text 



fig. 158a, }>. 

 Black River: St. Joseph Inland, Lake Huron. 



Oncoceras lycns (Hall). 



Orthoceras lycum Hall, Rep. Supt. Geol. Surv. Wisconsin, 1861, p. 45. 

 Oncoceras lycus Whitfield, Mem. Amer. Mus. Nat. Hist., 1, pt. 2, 1895, p. 69, pi. 

 9, figs. 13, 14.— Clarke, Geol. Minnesota, 3, pt. 2, 1897, p. 799, pi. 58, figs. 

 1-3.— Grabau and Shinier, N. A. Index Fossils, 2, 1910, p. 123, fig. 1365. 

 Black River (Platteville): Janesville, Wisconsin; Freston and Minneapolis, 

 Minnesota. 

 84243°— Bull. 92— vol 2—15 11 



