104 BULLETIN 89, UNITED STATES NATIONAL MUSEUM. 



been referred to this genus, ten of which are American and four European. Of 

 these, one appears to be a nomen nudum, one is a synonym of a species ah-eady 

 described, and three others have been referred to other genera. Now only nine 

 vahd species are recognized, and a revision of these will probably bring about a 

 further reduction. 



An alphabetical list of the species, location of the type, and its catalogue num- 

 ber is given below: 



Stegosaurus affinis Marsh, 1881 (nomen nudum) (Yale University Museum). 



Stegosaurus armatus Ma-rse, Dec, 1877 (No. 1850, Yale University Museum). 



Stegosaurus {Oiriosaurus) armatus (Owen), 1876 (No. 46013, Britisli Museum) =2>ace?i<ran(s armatus 

 (Owen). 



Stegosaurus (Hypsirophus) discurus (Cope), Mar., 1878 (Amer. Mus. Nat. Hist.). 



Stegosaurus duplex Marsh, Nov., 1887 (No. 1858, Yale University Museum) =fS'. Mnsrufaius. 



Stegosaurus durobrivensis Hulke (Britisli Museum). 



Stegosaurus (Omosaurus) hastiger (Owen), 1877 (Nos. 46320, 46321, 46322, Britisli Museum) =Z)acen- 

 trurus hastiger (Owen). 



Stegosaurus longispinus Gilmoke, 1914 (No. D54, Univ. of Wye). 



Stegosaurus marshi Lucas, Feb., 1901 (No. 4752, U. S. Nat. Mns.)=HopUtosaurus marshi (Lucas). 



Stegosaurus priscus 'SoFcsA, Mar., 1911 (No. R. 3167, British Museum). 



Stegosaurus (Hypsirophus) seeleyanus (Cope), June, 1879 (Amer. Mus. Nat. Hist.). 



Stegosaurus stenops Marsh, Nov., 1887 (No. 4934, U. S. Nat. Mus.). 



Stegosaurus sulcatus Marsh, Nov., 1887 (No. 4937, U. S. Nat. Mus.). 



Stegosaurus ungulatus Marsh, Dec, 1879 (No. 1853-1858, Yale Univ. Museum). 



,| Description of Species. 



With one exception the following descidptions are based on type-specimens in 

 the United States National Museum. The reference to the original description is 

 followed by citations of the more important literature which further elucidates the 

 species under consideration. 



The parts of the skeleton constituting the type are listed, and the locality, 

 geological horizon, name of the collector, and catalogue number are given in each 

 case, so that a permanent record of the type material will hereafter be available. 



In the discussion of the species the original description will be quoted in its 

 entirety, followed by a historical account of the specimen and a further description 

 of such parts of the skeleton as seems necessary to supplement the original text. 



STEGOSAURUS STENOPS Maish. 

 Plates 2-9 and 11-17, 19; 22, fig. 3; 23, figs. 2, 3, 4, 6; 24. 



Stegosaurus stenops Marsh, Amer. Journ. Sci. (3), vol. 34, 1887, pp. 414, 415, pi. 6; Geol. Mag. (3), 

 vol. 5, 1888, pp. 11-15, pi. 1. — Ltdekker, Cat. of Fossil ReptUia and Amphibia in the British 

 Museum, pt. 1, 1888, p. 176, fig. 31. — Zittel, Handbuch der Palaeontologie, vol. 1, 1890, p. 

 745, figs. 650, 654.— Marsh, Amer. Journ. Sci (3), vol. 39, 1890, p. 426, pi. 7, fig. 2; vol. 42, 

 1891, p. 179.— Cope, Trans. Amer. PhUos. Soc, vol. 17, 1892, p. 18 (Hypsirophus ).— Marsh, 

 16th Ann. Rept. U. S. Geol. Siu-v., pt. 1, 1896, p. 186, pis. 43 and 47, fig. 3; Mon. 27, U. S. 

 Geol. Surv., 1897, p. 499, fig. 52.— Woodward, Outlines of Vertebrate Paleontology, 1898, p. 

 212, fig. 131.— NopcsA, Foldtani K6zl6ny, Budapest, vol. 31, 1901, p. 215.— Hat, Bull. 179, 

 U. S. Geol. Survey, 1901, p. 496.— Lull, Amer. Journ. Sci., vol. 29, 1910, pp. 206, 208; vol. 30, 

 1910, p. 373; Verhandlungen des VIII. Internationalen Zoologen-Kongresses zu Graz, 1910, 

 p. 677.— Zittel, Grundzuge der Palaeontologie, pt. 2, 1911, p. 293, fig. 442.— Huene, Neuea 

 Jahrbuch, vol. 37, 1914, pp. 580, pi. 10. 



Biracodon laticeps Marsh, Amer. Journ. Sci., vol. 24, 1887, p. 416, pi. 9; Geol. Mag. (3), 1888, pp. 11-15, 

 pi. 3; 16th Ann. Rept. U.S. Geol. Surv., pt. 1,1896, p. 193, pL 51. (Not X>. Zaiiceps Marsh, 1881.) 



