The Fresh-Water Tertiary of Northwest- 

 ern Texas. American Mtcseurn 

 Expeditions of 1 8gg-igoi . 



By J. W. GiDLEv. 



AUTHOR'S EDITION, extracted from BULLETIN 



OF THE 



limerlcau ||lxtseum of glatuval gistovti, 



Vol. XIX, Article XXVI, pp. 617-635. 

 Neiu York, Novemhe}' 2 / , igoj. 



