341 



FAMILIES UNDETERMINED, APPARENTLY INTERMEDIATE TO THE PLEURODIRIDiE 



AND THE CHELYDRID^E. 



BAPTEMYS. 



BAPTEMYS WYOMINGENSIS.. 



Leidy: Pr. Ac. Nat. Sc. 1870, 4; Hayden's Eep. Geol. Sar. Wyomiug, 1871,367; 



Hayden's Eep. Geol. Sur. Montana, 1872, 307. 

 Adocus wyomingensis. Cope: Pr. Am. Pail. Soc. 1870, 297; Ext. Batrachia, 



Eeptilia N. Am. in Trans. Am. Phil. Soc. 1870, 233. 



Described page 157, and represented by Figs. 1, 2, Plate XII, and Fig. 6, 

 Plate XV. From' the Bridger Eocene of Wyoming. 



CHISTERNON s. Chistemum. 



Leidy : Pr. Ac. Nat. Sc. 1872, 102. 



Chisternon undatum. 



Baena undata. Leidy: Pr. Ac. Nat. Sc. 1871, 22S ; Hayden's Eep. Geol. Sur. 

 Montana, 1871, 369. 



Described page 169, and represented by Figs. 1, 2, Plate* XIV, under the 



name of Baena undata. From the Bridger Eocene of Wyoming. 



Chisternon undatum, in the presence of an additional pair of plates to the 



plastron, resembles the existing Sternothaerus. 



BAENA. 



Baena arenosa. 



Leidy : Pr. Ac. Nat. Sc. 1870, 123 ; 1871, 228 ; Hayden's Eep. Geol. Sur. Wyo- 

 miug, 1871, 367 ; Hayden's Eep. Geol. Sur. Montana, 1872, 368. 

 Baena affinis. Leidy : Hayden's Eep. Geol. Sur. Wyomiug, 1871, 367. 



Species described page 161, and represented by Figs. 1 to 3, Plate XIII, 

 under the names of Baena arenosa and Baena affinis, Figs. 1 to 5, Plate 

 XV, and Figs. 8, 9, Plate XVI. 



ANOSTE1RA. 



Anosteira ornata. 



Leidy : Pr. Ac. Nat. Sc. 1871, 102, 114 ; Hayden's Eep. Geol. Sur. Wyoming, 1872, 

 370. 



Described page 174, and represented by Figs. 1 to 6, Plate XVI. From 



the Bridger Eocene of Wyoming. 



Trionyciiid/e. 



TRIONYX. 



Trionyx guttatus. 



Leidy : Pr. Ac. Nat, Sc. 1809, GG ; 1870, 5 ; 1871, 228 ; Hayden's Eep. Geol. Sur. 

 Wyoming, 1871, 367 ; Hayden's Eep. Geol. Sur. Montana, 1872, 370. Ctope : 

 Ext, Batrachia, &c, 1870, 152. 



