160 



MEMOIRS OF THE CARNEGIE MUSEUM 



Nine species of the genus have been described from the deposits of North 

 America. Geologically these are arranged as follows: 



EXPLANATION OF PLATES. 



Plate XVIII. 



Fig. 1. Carapace of Baena arenosa Leidy. C. M. No. 2356. One-half natural size. 

 Fig. 2. Plastron of Baiina platyplastra. Type. C. M. No. 3227. One-third natural size. 



Plate XIX. 

 Fig. 1. Carapace of Bae7ia inflata. Type. C. M. No. 3406. 

 Fig. 2. Plastron of the same. Both figures one-third natural size. 



Plate XX. 

 Fig. 1. Carapace of Baena gigantea. Type. C. M. No. 3441. 

 Fig. 2. Plastron of the same. Both figures one-fourth natural size. 



Plate XXI. 

 Fig 1. Carapace of Echmafemys caUopyge Hay. C. M. No. 2371. 

 Fig. 2. Plastron of the same. Both figures one-third natural size. 



Plate XXII. 

 Fig. 1. Carapace of Echniateniys douglassi. Type. C. M. No. 3244. 

 Fig. 2. Plastron of the same. Both figures one-third natural size. 



Plate XXIII. 

 Fig. 1. Carapace of Echmatemys hollandi. Type. C. M. No. 3249. Viewed from the 

 right side. One-half natural size. 



Fig. 2. Carapace of Echmatemys depressa. Type. C. M. No. 2936. Natural size. 



Plate XXIV. 

 Fig. 1. Carapace of Echmatemys obscura. Type. C. M. No. 3252. 

 Fig. 2. Plastron of the same. Both figures one-third natural size. 



