TURTLES OF JUDITH RIVER FORMATION 57 



it must be of Judith River age. It is clear enough when the original 

 description is consulted that this species came only from Bijou 

 Creek, Colorado, and this is confirmed by Doctor Hay who has 

 examined the type now in the American Museum of Natural His- 

 tory and finds it labeled in Cope's handwriting as " Plastomenus 

 insignis. 10-9-1873, Colorado." It is therefore to be excluded from 

 the Judith River fauna, but not for the reasons given by Hatcher. 



7. Adocus lineolatus Cope. 



Type locality: Bijou Creek, 40 miles east of Denver, Colorado, 

 in beds believed to be Arapahoe in age. Also reported by Cope 

 from the mouth of the Bighorn River, Montana, and it appears in 

 his list of Judith River vertebrates, though according to Hatcher 

 this last reference is probably "due to an oversight." Fragments 

 that have been identified as this species have been found by Lambe 

 in Belly River beds of Red Deer River, Alberta, by Barnum Brown 

 in the Lance formation on Hell Creek, Montana, and by others in 

 the "Ceratops beds" (Lance formation) of Converse County, 

 Wyoming. Hatcher has expressed as his opinion 17 that the refer- 

 ence of Lambe's specimens "may be incorrect" and Doctor Hay 18 

 says: "It is the writer's opinion that it is unsafe to identify as 

 belonging to Adocus lineolatus specimens from the Judith River and 

 Laramie beds before far better materials of the species have been 

 collected from the type locality." He adds: "It is improbable 

 that the same species continued from the Judith River epoch to 

 the Arapahoe epoch," which latter, be it remembered, is the prob 

 able age of the type material. 



8. Basilemys ogmius (Cope). 

 Basilemys variolosa (Cope). 



Type locality: "From six miles west of the first branch of Milk 

 River, near latitude 49 ," in the province of Alberta, British America. 

 Because this locality is in the vicinity of Milk River it has been 

 assumed by Hatcher and others that the age must be Judith River, 



17 U. S. Geol. Surv., Bull. 257, p. 76. 



18 Fossil Turtles of North America, p. 248. 



