12 



measurements without illustrations that have sometimes been given. 

 I recognize tlie fact that si>eeies making is only the beginning of the 

 work of the palaontologist, but it is tlie beginning. 



The fossils described were found by myseif witli tlie exception of 

 one, for which due credit will be given in the proper place. 



Though this is only a preliminary paper, and I hope in the near 

 future to publish something more complete, I wish to heartily thank 

 tliose who have taken an interest in the work without whose lielp 

 I could not liave even done as well as I have done. Especially am I 

 indebted to Dr. Oscar J. C'raig and Prof. Fi'ed D. Smith, of the 

 Montana State University, who haA'e taken such an interest and done 

 so much to help me in my wox-k; and to Prof. M. J. Elrod for his con- 

 stant enthusiasm, encouragement, and practical assistance in more 

 ways tliat I can mention. To Dr. W. B. Scott, of Princeton Uni- 

 versity, I owe a debt of gratitude for his generosity and willingness at 

 all times to give advice and assistance. My friend Mrs. H. C. Irish, of 

 St. Louis, Mo., inked the drawings, but she is not responsible for any 

 incorrectness in them. To the many others who have given so much 

 help and shown so much kindness I can only express my- gratitude 

 in a general way. 



DESCRIPTIONS OF SPECIES. 

 ARTIODACTYLA. 



GOMPHOTHERIUM SERUS^ N. SP. 



Plate I. 



This species is represented by the anterior part of a mandible, with 

 alveoli of incisors and canine, the coossified symphysis, a first and sec 

 ond pi'emolar nearly complete, a broken third premolar, a complete 

 fourtli premolar, and a small portion of the first molar. One side of 

 the mandible is broken back of the symphysis, and the other below 

 the first molar. 



The symphysis is rather long and completely coossified. The in- 

 cisors were large, apparently decreasing somewhat in size from the 

 first to the third. The canine was close to the third incisor. The for- 

 amen mentale is below the front part of first pi-emolar. Premolar 1 

 is a simple cusp, but with two strong roots. It is placed nearly 

 equally distant between the canine and the second premolar. 



From premolar 1 the upper border of the ramus rises gently and 

 then more abruptly to premolar 2. The second premolar is compressed 

 laterally with a longer cutting edge but is only a trifle longer at the 

 base than the first. Premolar 3 is considerably larger than premolar 



