60 knowlton 



Turtles Mentioned by Hay as Tending to Show Identity 



or Close Similarity Between Species of the Judith 



River and Lance Formations. 



Following is the list of six species given by Doctor Hay 23 and of 

 which he says: "I shall take pains to give some details." 



1. Compsemys obscura (Leidy). 



Type locality: Near Long Lake, on the Missouri River below 

 Fort Clark, North Dakota, in beds regarded as belonging to the 

 Lance formation. It has otherwise been collected only in beds of 

 the Lance formation ("Hell Creek beds") on Hell Creek, Montana. 



This species was included by Cope 24 in his list of Judith River 

 vertebrates, but without giving any evidence in support of such 

 reference, and presumably on the authority of Cope's list it is in- 

 cluded by Osborn 25 in his list showing the "distribution of the land 

 and fresh-water Cretaceous vertebrates in the west," as occurring 

 in Montana and hence "by inference" in the Judith River fauna. 

 Compsemys obscura as well as its companion species, C. victa, was 

 excluded from the Judith River fauna by Hatcher, who says, "In 

 no descriptions of either of these species can I find any suggestion 

 that remains of either have been described from Montana." That 

 C. obscura is properly excluded from the Judith River is shown by 

 Doctor Hay, who says, 26 "This species is included by Cope in his 

 list of Judith River fossils, but the writer knows of no specimens 

 that confirm the statement." Curiously enough, however, this 

 species is the first one given by Doctor Hay 27 as occurring in both 

 Judith River and Lance formations! 



2. Compsemys victa Leidy. 



Type locality: Long Lake, on the Missouri River below Fort 

 Clark, North Dakota, in beds regarded as belonging to the Lance 

 formation, that is the same locality and formation as the last. 



^Proc. Indiana Acad. Sci., 1909, p. (of reprint) 21. 



24 U. S. Geol. and Geogr. Surv. Terr., Bull. vol. 3, 187, p. 573. 



25 Cont. Canadian Palcont., vol. 3, 1902, pt. ii, p. 12. 



26 Fossil Turtles of North America, 1908, p. 236. 



17 Proc. Indiana Acad. Sci., 1909, p. (of reprint) 21. 



