SYNOPSIS. 



213 



The type specimen (number 1037) of this species was discovered by 

 JMfssrs. J. W. Chew and B. D. Smith, near Bitter Greek, Wyoming, in 1872. 



This specimen consists of upper premoUirs, molars, and a radius. 



The geological horizon is in the Bridger beds of the Aliddle Eocene. 



The known remains of this species are preserved in the Museum of 

 Yale College. 



Tiuoceras latum. Marsh, n. s. 



"Woodcuts: 1S9 :inil 190, below. 



Figure 189. — Nasals of Tinoceras latum. Marsh (No. 1242). 

 a, side view ; 6. top view ; c. Iront view. 



One-fifth natural size. 



FiGDRE 190. — 'S:isaiso{ 7woceras latum. Marsh (No. 1533). 

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



One-fiftli natural size. 



The snout in the type specimen of this species tapers toward the end, 

 but bears a pair of low rounded tubercles, directed iienrly forward, and 

 only slightly outward or upward. They are separated in front, along the 

 median line, by an open suture between the nasal bones, 'i'liese ]iroject 

 forward beyond the protuberances, and tei-minate ditierently on the two 

 sides, the left coming' nearly to a point, while the right is a little shorter, 

 and ends with an oblique sutural surface. 



The skull presents a trainsverse ridge abo\e tlie In-aiii cavity, uniting 

 the parietal protuberances. 



