NO. IGOG. OSTEOLOGY OF VAMPTOISAURUS—aiLMORE. 269 



Camptosaurus defvessus^ new species. (Cat. No. 4753, U.S.N.M.) 

 Camptosaurus dispar Marsh. (No. 1877, Yale University Mu- 

 seum.) 



Camptosaurus iriK-eyi Nopcsa. (Location of type unknown.) 

 Camptosaurus leedsi Lydekker. (Coll. of A. N. Leeds, Eyebury, 

 En<z;land.) 



Camptosaurus medius Marsh. (No. 1880, Yale University Mu- 

 seum.) 



Camptosaurus nanus Marsh. (Cat. No. 2210, U.S.N.M.) 

 Camptosaurus prestivichil Lydekker. (Museum in Oxford, Eng- 

 land.) 



Camptosaurus valdensis Lydekker. (No. R167, British Museum.) 



SYSTEMATIC DESCRirTION AND REVISION OF SPECIES. 



In the description and revision of the various species to follow. 

 Hatcher's method of treatment in his monograph on the Ceratopsia is 

 adopted, with modifications. A reference to the original description 

 of each Avill first be given,, followed by references to the more impor- 

 tant literature w^hich further elucidates the species under considera- 

 tion. These references will be arranged in chronological order. 



'\^^ien possible, the parts constituting the type will be listed and 

 definitely located, also the name of the museum to which each belongs, 

 as well as the distinctive catalogue numbers which have been assigned 

 to them. The locality and geological horizon from which the speci- 

 men came, and the name of the collector, when known, will be given, 

 so that in each instance a permanent record of the character and loca- 

 tion of the type material will hereafter be available. 



In the discussion of the species, the original description of each will 

 first be quoted, followed by a further description of such parts of the 

 skeleton as considered not sufficiently elucidated in the original text, 

 and a presentation of my own views. In conclusion an attempt will 

 be made to give a brief characterization of each valid sj^ecies. 



CAMPTOSAURUS DISPAR Marsh. 



Camptonotus dispar Marsh, Anier. Journ. Sci. (3), XVIII, 1879, pp. 501- 



503, pi. III. 

 Camptosaurus dispar Marsh, Amer. Journ. Sci. (3), XXIX, 1885, p. 109. 

 Caiitptusaurus dispar Lydekker, R. Cat. foss. Reptilia and Amphibia Brit. 



Mus., Pt. 1, 1888, p. 192, fig. 36. 

 Camptosaurus dispar Marsh, Amer. Journ. Sci. (3), XLIV, 1892, p. 176, 



pi. v; XLVII, 1894, pp. 245-246, pi. vi ; XLVIII, 1894, p. 85, pi. v, fig. 1; 



Geol. Mag., Dec. 3, I, 1894, pp. 19.3-19.5, pi. vi ; 16tli Ann. Rept. V. S. 



Geol. Surv. 1894-95, Pt. 1, 1896, p. 196, pis. liv, lvi ; Compt. rend., 3 me 



Congres International de Zoologie, Leyden, 1890, pp. 196-211, fig. 7; 



Men. U. S. Geol. Surv., XXVII, 1897, p. 502, pi. xxiii; Amer. Journ. 



Sci. (4), VII, 1899, p. 232, fig. 2. 



