198 BULLETIN 92, UNITED STATES NATIONAL MUSE I'M. 



Ceratocephala horani (Billings). 



Acidaspis horani Billings, Geol. Surv. Canada, Rep. Progr. for 1853-1856, 1857, 



p. 341; Geol. Canada, Geol. Surv. Canada, 1863, p. 190, fig. 190. 

 Ceratocephala Horani Vogdes, Proc. Acad. Nat. Sci. Philadelphia, 1877, p. 140. 



Clarke, 10th Rep. State Geol. New York, 1891, pp. 69, 71; 44th Rep. New 



York State Mus., 1892, pp. 99, 101. 

 Trenton: Riviere a la Friponne near Cape Tourment, Canada. 



Ceratocephala narrawayi Raymond. 



Ceratocephala narrawayi Raymond, 7th Rep. State Geol. Vermont, 1910, p. 234, 



pi. 38, fig. 5; pi. 39, fig. 15; Ann. Carnegie Mus., 7, 1910, p. 73, pi. 18, fig. 



5; pi. 19, fig. 15. Perkins, 8th Rep. Vermont State Geol., 1912, pi. 18, 



fig. 5. 

 Chazyan (Crown Point): Chazy, New York. 



Ceratocephala nodulata Van Ingen. 



Ceratocephala nodulata Van Ingen, School of Mines Quart., 23, 1901, p. 44, 



fig. 10; p. 41, figs. 4, 5. 

 Niagaran (St. Clair): St. Clair Spring, Independence County, Arkansas. 



CERATOCEPHALA TRENTONENSIS? Vogdes. See Odontopleura trentonensis. 



CERATOPEA Ulrich. Genotype: C. keithi Ulrich. 



Ceratopea Ulrich, Bull. Geol. Soc. Amer., 22, 1911, p. 665. 



Ceratopea keithi Ulrich. 



Operculum of ?Maclurea, Bassler, Bull. Geol. Surv. Virginia, 2a, 1909, pi. 20, 



fig. 3. 



Ceratopea keithi Ulrich, Bull. Geol. Soc. Amer., 22, 1911, p. 665. 

 Canadian (Beekmantown) : Wytheville, Virginia; Tennessee; Missouri. 



CERATOPORA Grabau. Genotype: C. jacksoni Grabau. 



Ceratopora Grabau, Proc. Boston Soc. Nat. Hist., 28, 1899, p. 414; Bull. Buffalo 

 Soc. Nat. Hist., 6, 1899, p. 132. 



Ceratopora? marylandica Swartz. 



Ceratopora? marylandica Swartz, Maryland Geol. Surv., Low. Dev., 1913, p. 220, 



pi. 26, figs. 6, 7. 

 Helderbergian (Keyser): Keyser, West Virginia; Maryland. 



Ceratopora regularis Grabau. 



Ceratopora regularis Grabau, Michigan Geol. Surv., Geol. Ser., 1, 1909, p. 109, 



pi. 11, fig. 8. 

 Upper Monroan ( Amherstburg) : Detroit River opposite Amherstburg, Ontario. 



Ceratopora tenella (Roininger). 



Syringopora tenella Reminder, Geol. Surv. Michigan, 3, pt. 2, 1876, p. 81, pi. 30, 



fig. 4. 

 Ceratopora tenella Grabau, Michigan Geol. Surv., Geol. Ser., 1, 1909, p. 110, pi. 14, 



fig. 6. 



Niagaran: Point Detour, Drummonds Island, Lake Huron. 

 Upper Monroan (Anderdon): Near Amherstburg, Ontario. 



CERATOPSIS Ulrich. Genotype: Beyrichia chambersi Miller. 



Ceratella Ulrich, Jour. Cincinnati Soc. Nat. Hist., 13, 1890, p. 113 (nom. mid.). 



Ceratopsis Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 675; Zittel-Eastman Textb. 

 Pal., 1, 1900, p. 644. Ulrich and Bassler, Proc. U. S. Nat. Mus., 35, 1908, p. 

 308. Bormema, Mitt. Min. Geol. Inst. Groningen, 2, 1909, p. 39. Cuming?, 

 32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, p. 1040. Grabau and 

 Shimer, N. A. Index Fossils, 2, 1910. p. 352. Bassler, Zittel-Eastman Textb. 

 Pal., 2ded., Iol3, p. 738. 



