MEGACEROPS TYLERI, A NEW SPECIES OF TITANO- 



THERE FROM THE BAD LANDS OF SOUTH 



DAKOTA 



RICHARD S. LULL 



Massachusetts Agricultural College, Amherst, Mass. 



(WITH PLATES III AND IV) 



The Amherst College Palaeontological Expedition of 1903, under 

 theTeadership of Professor F. B. Loomis, was remarkably fortunate 

 in securing the greater part of a huge titanothere, apparently repre- 

 senting a species unknown to science which, aside from this, has the 

 additional value of having the skull and limbs of one individual 

 associated beyond doubt. The specimen was therefore deemed 

 worthy of careful description, the privilege of which has been granted 

 the writer through the courtesy of Dr. Loomis. 



GEOGRAPHICAL AND GEOLOGICAL LOCALITY 



The specimen was found by Mr. T. C. Brown, Amherst College 

 1904, near the head of Bear Creek, a tributary of the Cheyenne 

 River in South Dakota. The exact locality was on the north side 

 of Spring Draw basin, about ten miles from the mouth of Bear Creek. 

 Here some two hundred feet of titanothere beds were found, lying 

 upon Fort Pierre deposits, in which titanothere bones were discovered 

 from a point six feet above the contact upward; the specimen under 

 consideration lying thirty-five feet above the base of the beds, hence 

 in the upper part of the lower division. 1 



If one may judge from the summary of characters given by Hatcher 

 and others, the specimen would be considered a middle-bed form 

 with some upper-bed characteristics, as it is far from being primitive. 



CHARACTER AND CONDITION OF THE SPECIMEN 



The skeleton, which is No. 327 of the Amherst College Zoological 

 Collection, consists of a skull and jaws, the atlas, axis, and the fourth, 

 fifth, and sixth cervical vertebrae. Nine dorsals, most of them spine- 



1 J. B. Hatcher, American Naturalist, Vol. XXVII (1893), p, 218. 



443 



