■ 100 Forty-fourth Report on the State Museum, 



In 1875, S. A. Miller described from the Hudson Eiver group, 

 Acidaspis anchoralis, to which reference has been made, and J. O'NeaUi.* 



In 1876, Professor Hall referred to Acidaspis n. sp. ? forms subse- 

 quently described as Ceratolichas gryps, Hall, f and G. dracon, Hall, J 

 from the Uorniferous limestone of New York. At the same time he 

 referred the species Terataspis grandis. Hall, and Lichas Eriopns, Hall, 

 to Acidaspis and indicated a pygidium of L. Eriopis as Acidaspis 

 {Terataspis) sp. ? § 



In 1879, Mr. C. D. Walcott described, || without illustration, Acidaspis 

 parvula from the Trenton limestone of Trenton Falls, N. Y. 



In 1879, Professor Hall described ^ Acidaspis ftmbriata from the 

 Niagara group at Waldron, Indiana. The original specimen was a 

 free cheek of which a figure was first given in 1883.** 



In 1887, Mr. A F. Foerste describedf f the species Acidaspis Orfoni 

 from the Clinton shales near new Carlisle, Ohio. 



In the Palaeontology of New York, Vol. VII, 1888, Acidaspis callicera 



■ was described,|J a species occurring in the Schoharie grit and Cor- 

 niferous limestone of New York and Canada. A large pygidium was 

 also referred to this genus but without specific name,|||| (Corniferous 

 limestone, Cayuga, Ontario). Under the name Acidaspis Bomingeri, 

 was described^^ the form which we have taken as a type of new sub- 

 genus, Ancyropyge, from the Hamilton fauna of Little Traverse Bay, 

 Michigan. 



These North American species arrange themselves under the pro- 

 posed grouping as follows : 



Genus Ceratocephala, Warder, 1838. 

 Ceratocephala, Warder, sensu stricto. 

 C. goniata. Warder, 1838. 



Synonyms Acidaspis Danai, Hall, 1862. 



A. Ida, Winchell and Marcy, 1865. 



Acidaspis, Murchison, 1839. 

 A. anchoralis, Miller, 1875. 



= ??A. ceralepta, Anthony (sp.), 1838. 

 A. tuherculatuSy Conrad, 1840. 



* Cincinnati Quarterly Journal of Science, vol. 2, p. 86, fig. 9. 



t Illustrations of Devonian Fossils, pi. 19, fig. 1. 



t Idem, flgs. 2, 3. 



§ Idem, flgs. 4-11, 12. 



II Thirty-first Report N. Y. State Museum (1879), advance sheets, p. 16. 



IT Description of New Species from the Niagara group, p. 20. 



** Eleventh Report State Geologist of Indiana, pi. 33, fig. li. 



tt Bulletin Scientific Laboratories Denison University, vol. 2, p. 90, pi. 8, flg. 1. 



XX P. 69, pi. 16 B, figs 1-13. 



Illl PL 16 B, flg. 14. 



HIT P. 71, pi. 16 B, flgs. 15-18. 



