110 MEMOIRS OF THE CARNEGIE MUSEUM 



emilice Hay. The better preserved specimen, C. M. No. 3443, consists of a nearly 

 complete carapace and plastron, the former lacking small portions of the hinder 

 borders posterior to the inguinal notches. The missing margin of the right side 

 was apparently lost in life, as shown by the healed condition of the bone at this 

 point. The specimen was collected by Earl Douglass during the season of 1915 at 

 Wagon-hound Bend, on White River, Uinta County, Utah, from the lower part 

 of Horizon B. It will be seen from the table of comparative measurements given 

 below that this specimen has about the same dimensions as the type of the species. 

 It differs, however, in the more angularly rounded contour of the front lobe, a 

 feature in which it also is different from three of the other specimens here referred 

 to this species. Whether this difference represents a sexual character, or is only 

 an individual variation, I am unable to determine. 



In many respects the present specimen is very close to the type of Baena clara 

 from the Bridger formation, but the great length of the third vertebral scute, as 

 compared with the others of the series, is regarded by Hay as one of the chief dis- 

 tinguishing characters of the species, and together with the much shorter pos- 

 terior lobe, as compared with the longer lobe in B. clara, appears to show that its 

 closest affinities are with the present species. 



An anterior portion of a carapace and plastron, C. M. No. 3253, on account 

 of its close general resemblance to the specimen discussed above, is provisionally 

 referred to the same species. This specimen is from Horizon C of the Uinta for- 

 mation and is the only individual in the collection, referred to the present species, 

 which is positively known to have come from that horizon, all of the others having 

 been found in strata belonging to Horizon B. It was collected by Earl Douglass 

 two or three miles west of Well No. 2, Uinta County, Utah. 



A third specimen, C. M. No. 2159, consisting of a complete plastron and the 

 entire central part of the carapace, but lacking portions of both sides, is also 

 referred to this species. It was collected by Earl Douglass in 1908, in the Devil's 

 Playground, Uinta Basin, Uinta County, Utah, from Horizon B (near top) or C 

 (near base). 



A fourth individual, C. M. No. 3243, has a nearly complete carapace and 

 plastron, the latter lacking the posterior lobe. It was collected by Messrs. Earl 

 Douglass and J. T. Goetschius, October 2, 1908, about one mile northeast of Well 

 No. 2, "near first gap," Uinta County, Utah, from Horizon B. 



The fifth specimen, C. M. No. 3257, consists of a carapace and plastron, the 

 former lacking some of the posterior border. This turtle also was collected by 

 Earl Douglass and J. T. Goetschius, July 30, 1908, south of Kennedy's Hole and 



