52 KNOWLTON 



Lack of space at that time precluded the full presentation of the 

 data on which the above statements were based. Inasmuch as 

 this mild remonstrance does not appear to have attracted attention, 

 and since the turtles are still being used to "prove" close relation- 

 ship between the Judith River and Lance ("Ceratops beds") for- 

 mations, it seems opportune to set forth the facts as they are. In 

 a paper 3 just published Dr. O. P. Hay writes as follows: "My 

 study of the fossil turtles indicates that the species of these animals 

 rarely pass from one epoch to another. If they have ever done so 

 they passed from the Judith River into the Lance Creek epoch. 

 There are five or six species of Judith River turtles which are rep- 

 resented in the Lance Creek and Hell Creek beds by turtles of iden- 

 tical or very closely related species." 



In the following pages it is proposed first to take up the species 

 of turtles mentioned by Hatcher 4 as belonging to the Judith River 

 formation, and to indicate the type locality for each species as well as 

 its subsequent distribution so far as this is a matter of published 

 record. Later in this paper the species enumerated by Doctor Hay 

 will be similarly treated, and finally some remarks will be presented 

 on the results of this showing. 



Turtles of the Judith River Formation Enumerated by 



Hatcher. 



1. Trionyx foveatus Leidy [Aspideretes foveatus (Leidy) Hay]. 



Type locality: "Bad Lands of the Judith River, Nebraska 

 Territory." Fragments collected by Doctor Hayden and named 

 and described by Doctor Leidy in 1856 5 . Subsequently Leidy 

 figured two of the type specimens, together with another specimen, 

 identified doubtfully as the same species, from Long Lake below 

 old Fort Clark on the Missouri River, North Dakota, the latter 

 belonging to the Lance formation. On this point Hatcher says: 

 "Considering the difference in the age of these deposits, it is quite 



8 Where do the Lance Creek ("Ceratops") Beds belong, in the Cretaceous or in the 

 Tertiary? Indiana Acad. Sci., Proc, 1909 (issued Oct. 1910), p. 21 (of reprint). 

 * U. S. Geol. Surv., Bull. 257, 1905, pp. 72-80. 

 8 Acad. Nat. Sci., Phila., Proc, vol. viii, 1856, p. 73. 



