124 BULLETIN 110, UNITED STATES NATIONAL MUSEUM. 



end, it approaches Albertosaurus (Dryptosaurus) most nearly; but as the dentary 

 of Albertosaurus has sockets for 15 teeth the presence of 13 in this individual would 

 appear to show its distinctness. 



Is is quite possible that this dentary pertains to the genus Deinodon, but that 

 can not be. absolutely determined because the dentary of that genus is unknown. 

 The positive identification of this specimen must therefore await the discovery 

 of additional material. 



Specimen No. 8355, U.S.N.M., consisting of a single tooth/ resembling in nearly 

 every detail the D-shaped tooth figured by Leidy 2 and which he attributed to 

 Deinodon Jiorridus, was collected by C. F. Bauer, "30 miles south of Farmington, 

 New Mexico, 1 mile east of reservation line from the lower part of the Kirtland 

 formation in 1915. 



LABROSAURUS FEROX Marsh. 



Plate 33, figs. 1, 2, and 3. 



Labrosaurus jerox Marsh, 0. C, Amer. Journ. Sci., ser. 3, vol. 27, 1884, p. 333, pi. 9; Sixteenth 

 Ann. Rep. U. S. Geol. Surv., pt. 1, 1896, p. 163, pi. 13, figs. 2-4.— Walcott, C. D., Science, ser. 2, 

 1900, vol. 11, p. 23.— Merrill, G. P.', Cat. Fossil Vertebrates U. S. Nat. Mus., pt. 2, 1907, 

 p. 73.— Gilmore, C. W., Bull. No. 89, U. S. Nat. Mus., 1914, p. 25. 



Antrodemus valens Hay, O. P., Bull: No. 179, U. S. Geol. Surv., 1902, pp. 489-490. 



Labrosaurus Jerox Hay, O. P., Proc. U. S. Nat. Mus., vol. 35, 1908, pp. 352-353. 



Type specimen. — No. 2315, U.S.N.M. Consists of a left dentary in which are 

 the roots of several teeth and one or more germ teeth. Collected by M. P. Felch 

 in 1883. 



Type locality. — Quarry No. 1, Garden Park, near Canon City, Fremont County, 

 Colorado. 



Horizon. — Morrison, Upper Jurassic. 



The original description 3 by Marsh is as follows: 



a peculiar dentary bone, recently found, and here referred to Labrosaurus, is shown on plate 9, figure 4. 

 It is edentulous in front, and the posterior portion is much decurved. The teeth are more triangular 

 than in the other genera of this order. The species it represents may be called Labrosaurus ferox. 



This brief description constitutes practically all that had been written regard- 

 ing this species up to the year 1908, when Hay i reviewed the genus. This review 

 is most thoroughly done, and since the conclusions reached largely apply to-day, 

 his remarks are here quoted in their entirety: 



In 1879 6 Marsh established the genus Labrosaurus, with his Allosaurus lucaris as the type. This 

 species had been described- in 1878 6 and was based on materials found in the Upper Jurassic of Colorado. 

 In this earliest description there was mentioned only an anterior dorsal vertebra. In the description 

 of 1879 cervical and dorsal vertebrae and fore-limb bones were briefly described. So far as the writer 

 knows no part representing this species has ever been figured. 



In 1884 7 Marsh added a second species to the genus, Labrosaurus Jerox. The only part of this 

 animal that was mentioned is the left dentary. Marsh here made the statement that in Labrosaurus the 



i Prof. Paper 98 Q, p. 288, pi. 73, fig. 4, 1916. 



2 Leidy, Joseph, Amer. Philos. Soc., Trans., vol. 11, 1859, pi. 9, figs. 41, 42. 



a Amer. Journ. Sci., ser. 3, vol. 27, 1884, p. 333, pi. 9, figs. 4-6. 



* Proc. U. S. Nat. Mus., vol. 35, 1908, pp. 352-353. 



6 Amer. Journ. Sci., vol. 17, p. 91. 



8 Idem, vol. 15, p. 243. 



1 1dem, vol. 27, p. 333, pi. 9, figs. 4-6. 



