Loomis — Reptiles from the Titanothere Beds. 431 



Along with these fossils was an unusual bit of evidence of 

 the river origin of the Titanothere beds, supplementary to that 

 already given by Matthew* and others. On the head of Bear 

 Creek and along the north side of Spring Draw Basin, about 

 thirty feet above the undoubted base of the White River beds, 



11 



was found a considerable collectio'n of Ft. Pierre fossils. The 

 collection consists of 15 B acuities ovatus S., 2Baculites grandis 

 H. & M. Over 100 baculites were seen, but only such as had 

 satisfactory sutures were saved, and a specimen of a Mosasaur 



* Matthew, Amer. Nat., vol. xxxiii, 1899, p. 403 ; Davis, Proc. Amer. 

 Acad. Arts and Sciences, vol. xxxv, 1900, p. 345. 



