200 



DINOCERATA. 



Dinoceras laticcps, Marsh. 

 (Plates X-XIV, XLIII.) 



Woodcuts: 14, p. 19; 22, p. 25; 27, p. 26; 33, p. 30; 47, p. 43; 50, p. 44; 57, 58, p. 54; 

 and 112, p. 103; 136, p. 138; 139, 140, p. 149. 



Marsh, American Journal of Science and Arts (3), Vol. VI, p. 301, October, 1873; Vol. 



XI, p. 164, Plate V, February, 1876. 

 Osborn and Speir (Uintatherium laticeps).^American Journal of Science and 



Arts (3), Vol. XVII, pp. 304, 305, 307, April, 1879. 



The type of this species possesses the main characters of Dinoceras, 

 but, in the premaxillaries, palate, and brain-cavity, shows an approacli 

 to Tinoceras, especially Tinoceras pugnax. It apparently represents a 

 sub-genus of Dinoceras, which may be called Paroceras. 



The type specimen of this species (number 1039) was obtained in 

 August, 1873, by Mi*. L. Lamotte and the author, near Spanish John's 

 Meadow, Wyoming. 



This specimen consists of a skull, lower jaws, vertebrae, etc. 



A second specimen, a female (number 1202), consisting of a skull and 

 other ])arts of the skeleton, was found by the author, in August, IS 73, near 

 Henry's Fork, about thirty miles west of Green River, Wyoming. 

 Additional specimens are numbers 1197, 1222, 1239, and 1264. 



The geological horizon of this species is in the Dinoceras beds of the 

 Middle Eocene. 



Tlie known remains of this species are in Yale College Museum. 



Dinoceras liicare, Marsh. 

 (Plate IX.) 



Woodcuts: 46, p. 43; 103, 104, 105, p. 84; 110, p. 98; 172. 173, below. 



Figure 172. — >Jasals of Dinoceras lucare, Marsh (No, )0.S8). 

 a. side view ; b. top view ; c. front view. 



One-fiflh nntiiral size. 



