341 



FAMILIES UNDETERMINED, APPARENTLY INTERMEDIATE TO THE PLEURODIRIDiE 



AND THE CHELYDRID/E, 



BAPTEMYS. 



Baptemys wyomingensis 



Leicly : Pr. Ac. Nat. Sc. 1870, 4 ; Haydeu's Ecp. Geol. Siir. Wyomiilg, 1S71, 367 ; 



Haydeu's Rep. Geol. Sur. Montaua, 1872, 307. 

 Adocus injoiniDffeniih. Cope: Pr. Am. Piiil. Soc. 1870, 297; Ext. Batracliia, 



Eeptilia N. Am. in Trau.s. 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. Chisternu?n. 



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



ChISTERNON UNDATL'M. 



Baena undata. Leidy : Pr. Ac. Nat. Sc. 1871, 228 ; Haydeu's Rep. Geol. Sur. 

 Montana, 1871, 3G9. 



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



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 SternotliEerns. 



BAENA. 

 Baena arenosa. 



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

 ming, 1871, 307 ; Haydeu's Rep. Geol. Sur. Montana, 1872, 308. 

 Baena affinis. Leidy : Haydeu's Rep. Geol. Sur. Wyoming, 1871, 307. 



Species described page 161, and i-epresented 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. 



ANOSTEIRA. 



Anosteira ornata. 



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

 370. 



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



the Bridger Eocene of AVyoniing. 



Trionychid^. 



TRIONYX. 



Trionyx guttatus. 



Leidy : Pr. Ac. Nat. Sc. 18G9, 00 ; 1870, 5 ; 1871, 228 ; Haydeu's Rep. Geol. Sur. 

 Wyoming, 1871, 367; Haydeu's Rep. Geol. Sar. Montana, 1872, 370. Cope: 

 Ext. Batracliia, &c., 1870, 152. 



