CATALOGUE OF TRILOBITES. 259 



A CATALOGUE OF NORTH AMERICAN SPECIES OF TRILOBITES. 



Accmtholoma Cou., 1840; 3d Aun. Rep. PaL Dept. New York GeoL Survey, 

 p. 205. (See Acidasjnn tuber culalua.) 



spinosa Cou. (See Acklaspis tuberculaius.) 



AciDASPLS Murch., Siluriau System, 1839, p. 658. Cambrian aud Siluriau. 

 Used as a subgroup by Clarke. Notes ou the genus Acidaspis, 1892, 

 p. 9; for species with a single large straight median spine on the 

 occipital ring, Acidaspis bright ii Murch. 

 Ceratocejihala Ward., 1838; Am. Jour. Sci., 1st series, vol. 34, p. 377. 

 Used in the generic sense bj'^ Clarke. Notes ou the genus Aci- 

 daspis, 1892, p. 9; for species with two straight divergent spines 

 on the occipital ring, Ceratocephala (joniata Ward. 

 Odontopleura Emm., 1839; De Tril., p. 53. 

 Used as a subgenus by Clarke. Notes on the genus Acidaspis, 

 1892, p. 9; for species having the occipital ring smooth or with 

 central tubercle, Odontopleura ovata Emm. 

 Arges Goldf. (in part), Neues Jahrb. fur Mineral, 1843, pp. 544, 556. 

 C'eraurus (Green) Loven, 1845, Kong. Svenska Vet. Akad., p. 46. 

 Polyeris Rouault, 1846; Bull. Soc. Geol. France, vol. 4, -p. .320. 

 Selenopeltis Cord, 1847; Prodr., p. 34. 

 Used as a subgenus by Clarke. Notes ou the genus Acidaspis, 1892, 

 p. 9; for species with coufliient glabella lobes, oblique thoracic, 

 pleural aud spineless pygidium, Selenopeltis buchi Barr. 

 Traj)elocera Cord., 1847; Prodr., p. 158. 



Dicranuras Con., 1841; 5th Ann. Rep. Pal. Dejit. New York Geol. 

 Survey, -p. 48. 

 Used as a subgenus by Clarke. Notes on the genus Acidaspis, 1892, 

 p. 9; for species with two recurved spines of great size on the 

 occipital ring, Dicraniirus hamatus Conrad. 

 Ancyropi/ge u. subgen. Clarke, 1892. Note on the gen\is Acidaspis, 

 p. 9. ' 

 Used as a subgenus to Ceratocephala, type Acidaspis rocmingeri Hall. 



.vNCHORALis Miller, 1875; Cincinnati Quart. Jour. Sci., vol. 2, p. 



349, figs 2-4. ef. Acidaspis ceralepta. Hudson. 



Ceratocephalcc (Acidaspis) anchor alis Glavlie, 1892. Note ou Acidaspis, 

 pp. 11 and 12, syn. to Ceratocejihala ceralepta. 



armatus. (See Acidaspis eriops.) 



CALLicKRA Hall, 1888; Pal. New York, vol. 7, pp. 69, 224, pi. 16 b, 



figs. 1-3. Clarksville, N. Y. Upper Helderberg. 

 Ceratocephala [Odontopleura) c.allickra Clarke, 1892. Note on Aci- 

 daspis, p. 13. 

 Ceratocephala ceralepta Auth., 18.38; Am. Jour. Sci., 1st series, 

 vol. 34, p. 379; figs. 1-2. Cincinnati, Ohio. Hudson. 

 ceralepta Meek, 1873; Pal. Ohio, vol. 1, p. 169, i)l. 14, figs. 8-9. 



