NEW FOSSIL TURTLES, WITH NOTES ON TWO 

 DESCRIBED SPECIES. 



By Charles W. Gilmore. 



Associate Curator, Division of Paleontology, United States National Museum. 



INTRODUCTION. 



During the summer of 1918 the Section of Vertebrate Paleontology 

 of the United States National Museum came into the possession 

 of a considerable number of well-preserved turtle specimens. Among 

 these are several that represent undescribed species and others that 

 contribute to a better understanding of the skeletal structure of 

 described forms. 



It is the purpose of the present paper to present the facts concern- 

 ing these specimens, thus making this information available to stu- 

 dents of the extinct Chelonia. 



Family PLEUROSTERNIDAE. 



NEURANKYLUS WYOMINGENSIS, new species. 



Plates 29 and 30. 



Type. — No. 7581, U.S.N.M., consists of the posterior half of the 

 carapace and plastron. 



Type locality. — Shoshone River, near Cody, Big Horn County, 

 Wyoming. 



Horizon. — Colorado shale, Upper Cretaceous. 



The specimen to be described was collected in the summer of 1912 

 by Mi\ D. F. Hewett, of the United States Geological Survey, from 

 the Colorado shale as exposed in the vicinity of Cody, Wyoming. 



A comparison of this somewhat imperfect specimen with the type 

 of Neurankylus haueri also in the National Museum collection, leads 

 me to provisionally refer it to that genus. The large size and general 

 proportions of the vetebral and costal scutes, and the close resem- 

 blance in the general form of both the carapace and plastron appears 

 to show the correctness of the above determination. If, upon the 

 discovery of more perfect specimens, this provisional assignment 

 proves to be correct, it represents the most ancient member of the 



Proceedings U. S. National Museum, Vol. 56— No. 2292, 

 115690— 19— Proc.N.M.vol.56 8 113 



