116 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.51. 



that these indicate that Brown's species is not identical with the one 

 here described. The vasodentine of the Texan specimen is more 

 branched than in the Mexican, nearly as much as represented in Bur- 

 meister's figure of G. asper. This is not well shown in figures 3-5 

 of plate 3. The second upper teeth are different ; likewise the upper 

 fourth tooth and the lower sixth ; as a close comparison of the figures 

 will show. 



NOTHROTHERIUM TEXANUM, new species. 

 Flutes 6, 7. 



Diagnosis. — Skull larger than that of the Brazilian species N. 

 escrivanense Reinhardt and equal to that of N. graciliceps Stock; 

 profile strongly convex ; pterygoid bullse widely open below : anterior 

 tooth with hinder face transversely concave ; hindermost upper tooth 

 nearly as large as the others, with a deep furrow on the hinder face. 



This species is based on a part of a skull now in the National Mu- 

 seum, No. 8353, which was obtained by exchange from the collection 

 of Baylor University, Waco, Texas. It w^as presented to that institu- 

 tion about 15 years ago by a clergyman who had secured it from some 

 person now unknown. It is reported to have been found in digging 

 a well, at a depth of 40 feet, in Wheeler Count}^, Texas. AMieeler 

 County adjoins Oklahoma and is in the third tier of counties from 

 the northern boundary of Texas. As to the geological age of this 

 species, we can hardly doubt that it belongs to the Pleistocene. 



This skull (pis. 6, 7), furnishes us many im.portant parts, 

 although it is considerably damaged. The whole upper surface is 

 present, and the base as far as thp front of the brain cavity. The 

 left maxilla is preserved, together with its teeth. A small part of the 

 right maxilla is likewise present. The bones surrounding the nasal 

 opening are retained, except the premaxillse. A small part of the 

 anterior end of the right malar is attached to the fragment of tlie 

 maxilla of that side; and the larger portion of the left malar has 

 been saved. In studying this specimen comparison has been made 

 with the skull of N othrotherium escrivanense^ as described by Rein- 

 hardt,^ with the type of N. graciliceps Stock from California;- also 

 with skulls of Choloepus liojfmanm. 



In comparison with the skull of the fossil species found in a cavern 

 in Brazil, the skull here described is considerably larger, the former 

 having a length of 270 mm., from the rear of the occipital condyles 

 to the front of the maxilla ; the Texan species, a length of 300 mm. 

 There are also differences in the form of the skull. In the Brazilian 

 species the profile is nearly straight from the rear of the frontals to 

 the anterior end of the nasals, while in the Texas form this outline 



iDanske Vidensk, Selsk. Skr., ser. 5, vol. 12, pp. 253-349, pis. 1-5. 

 2 Bull. Dept. Geol., Univ. Cal., vol. 7, p. 341. 



