VOLUME XXV NUMBER 4 



THE 



JOURNAL OF GEOLOGY 



MAY-JUNE 1917 



LABIDOSAURUS 1 COPE, A LOWER PERMIAN COTY- 

 LOSAUR REPTILE FROM TEXAS 



SAMUEL W. WILLISTON 



University of Chicago 



Although remains of the genus Labidosaurus are not rare in the 

 upper Clear Fork beds of Texas, it has only been lately that fairly 

 complete skeletons have been secured. During the past season 

 Mr. Paul C. Miller was fortunate in rinding, not far from the 

 paleontologically famous Craddock Ranch, near Seymour, Texas, 

 some half-dozen specimens, associated in a spot but a few square 

 yards in area — specimens which furnish nearly every detail of the 

 skeletal structure, excepting, as usual, the length of the tail. These 

 specimens come from a horizon that I have several times mentioned, 

 that from which the connected skeletons of Seymouria and Trimero- 

 rhachis, previously described, were obtained. Like those, these 

 skeletons were inclosed in hard clay nodules of a mottled red and 

 white color. The bones are rather soft and white in color, while 

 the matrix is very hard, making their preparation difficult. 



1 Labidosaurus Cope, Proc. Amer. Phil. Soc, 1896, p. 185; Case, Zobl. Bull., 

 II (1899), 231 (Pariotichus); Revision of the Cotylosauria (1911), 45, 101; Permo- 

 carboniferous Beds of North America, and Their Vertebrate Fauna, p. 137, 1915; Broili, 

 Paleontographica, XI (1905), 51; Williston, Jour. Geol., XVI (1908), 359; ibid., XXII 

 (1914), 65; ibid., XXII (1914), 414; Contributions from Walker Museum, I, No. 8 

 (i9i4),i57; ibid.,~No. 9 (1916), 221; Branson, Jour. Geol., XIX (1911), 136; v. Huene, 

 Bull. Amer. Mus. Nat. Hist., XXXII (1913), 351. 



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