572 THE BRIDGER EPOCH. 



is bordered by a narrow strip of the malar on the inner side, as far as the 

 anterior boundary of the orbit. 



The dentition is I. ; C. 1 ; Pm. 3 ; M. 3. The canine is a tusk of 

 compressed form, witli anterior and posterior cutting edges, and a strong 

 posterior curvature. Its fang is embraced one-third by the pi-emaxillary 

 bone, and is inclosed in a rib-like swelling of the sides of the cranium, 

 which extends upward and backward. The premolars have transverse cor- 

 date surfaces of attrition. These have probably resulted from the wearing 

 down of a chevron of two crests converging inward, in some with an inner 

 tubercle. On the molars this crescent is represented by a V, with the apex 

 inward ; on the last, the inner tubercle is at one side (the posterior) of the 

 apex 



Name. — I first applied the name Loxohphodon, with a diagnostic descrip- 

 tion, to this genus, in a short paper published August 19, 1872, as above 

 cited. The L. cornutus was there cited as the first species, and is here retained 

 as the type. I again described it more fully in a paper published August 

 22d, citing Eobasileus (August 20th) as a synonym, in which I was in error, 

 as indicated in the present book. The same nomenclature was employed 

 in a paper read before the American Association for the Advancement of 

 Science, held at Dubuque, commencing Augusl 23, 1872. 



Prior to the issue of the paper of August 22, 1 had (February 16, 1872) 

 provisionally applied the name Loxolophodon to the species there called Bath- 

 modon semicinctus Cope, without generic character. With further material it 

 appears that the Bathmodon semicinctus is very near to the B. radians, so 

 that the name Loxohpliodon was cancelled in this connection, and was used 

 again for the present genus without interference, especially as it was first 

 published as a nom^n nudum. 



Pi'ofessor Marsh, in the American Journal of Science and Arts, 1872 

 (September 21),* applied the name Tinoceras to a species {T. grandis) which 

 he has led us to infer belongs to this genus, but did not specify the generic 

 characters. He had previously applied it without description to the Uinta- 

 therium anceps, August 24 (and 19,t in an erratum, where Mastodon anceps 



* I did not receive this, and most of the other papers of Professor Marsh on this fauna, till early 

 in December, 1872. 



t These papers were not received by me till early m December, 1872. 



