CATALOGUE OF TRTLOBITES. 259 



A CATALOGUE OF NOETH AMEKICAN «1'EC1ES OF TKILOBITES. 



Acantholoma Con., 1840; 3cl Ami. Rep. Pal. Dept. New York Geol. Survey, 

 p. 205. (See Acidaspis tuberculatus.) 



spinosa Con. (See Acidaspis tuberculatus.) 



At'iUASPis Murch., Silurian System, 1839, p. 658. Cambrian and Silurian. 

 Used as a subgroup by Clai'ke. Notes on the genus Acidaspis, 1892, 

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

 occipital ring, Acidaspis hrightii Murch. 

 Ceratocephala Ward., 1838; Am.' Jour. Sei., 1st series, vol. 34, p. 377. 

 Used in the generic sense by Clarke. Notes on the genus Aci- 

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

 on the occipital ring, Ceratocephala goniata Ward. 

 Odontopleiira 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 ovala Emm. 

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

 Ceraurus (Green) Loven, 1845, Kong. Sveuska Vet. Akad., p. 46. 

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

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

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

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

 pleural and spineless pygidium, Selenopeltis huchi Barr. 

 Trapelocera Cord., 1847; Prodr., p. 158. 



Dicranurtis Con., 1841; 5th Ann. Rep. Pal. Dept. New York Geol. 

 Sui'vey, 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, Dicranurus hamatus Conrad. 

 Ancyropyge n. siibgen. Clarke, 1892. Note on the genus Acidaspis, 

 p. 9. ' 

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



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



349, figs 2-4. cf. Acidaspis ceralejjta. Hudson. 



Ceratocephala (Acidaspis) anchoralis Clarhe, 1892. Note on Acidaspis, 

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



armatus. (See Acidaspis eriops.) 



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



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

 Ceratocephala (Odontopleura) callicer.\ Clarke, 1892. Note on Aci- 

 daspis, p. 13. 

 Ceratocephala ceralepta Anth., 1838; Am. Jour. Sci., 1st series, 

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

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



