202 



DINOCEKATA. 



The post-glenoid process is large and strong, and the zygomatic 

 process of the squamosal presents a pit for the end of the malar bone just 

 in front of the glenoid cavity. Tlie occipital crest shows a median keel 

 on its posterior surface. 



A cervical centrum, from which the epiphyses have nearly separated, 

 shows that these vertebrns Avere proportionally shorter than in niunber 

 1255. The vertical diameter is to the longitudinal as 1 to .55, while in 

 number 1255 these dimensions are about as 1 to .6. 



A pyramidal bone, accomjianying these specimens, has the face for 

 the fifth metacarpal confluent with that for the luiciform, as in figures 117 

 and 118, page 108, instead of distinct, as on Plate XXXII, figure 6. 



The specimen (number 1229) upon which the species is based was 

 collected in October, 1873, by Messrs. J. W. Chew and S. Smith, at Tule 

 Springs, Wyoming. 



This specimen consists of fragments of the skull, limb bones, etc. 



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

 Middle Eocene. 



The known remains are preserved in Yale College Museum. 



TINOCERAS,' Marsh, 1872. 

 Tiiioceras aiieeps, ]\larsh. 



Woodcuts: 97, 98, p. SO; IVTi, ]■?(!, HT, l)elow. 



Figure 175. — Nasals of K/ioeera.! ajicejos, Itarsh (No. 12Ci;). 

 a. side view; h. (op view; c. front view. 



Oue-fiflh natural size. 



Marsh (Titanotherium ? anceps.) — American Journal of Science and Arts (3), 

 Vol. II, p. 35, July, 1871. 



(Mastodon anceps.) — -American Journstl of Science and Arts, Vol. IV, p. 123, 

 note, August, ls72. 



(Tinoceras anceps.) — American Journal of Science and Arts (3), Vol. IV 

 p. 322, October, 1872. (The name Ti/ioceras was published in advance, August 19. 

 1872, see Bibliography.) Vol. IV, p. 323, October, 1872; Vol. IV, p. 504, Decem- 

 ber, 1872; Vol. V, pp." 117, 122, February, 1873; Vol. V, p. 296, April, 1873. 



' Tivoo, to tear, and utpa?, horn. 



