166 LABYRINTHODONTIA. 



Genus EOSATJRUS, Marsh i. 

 Known only by vertebrse, which from their fully ossified centra 

 may indicate a member of this family. 



Eosaurus acadlanus, Marsh 2 . 

 The type species ; of large size, the vertebral centra having a 

 diameter of about 0,063 (2-5 inches). 

 Bab. North America. 



36820. Casts of two vertebral centra. The originals, which are the 

 types, were obtained from the Upper Carboniferous of 

 South Joggins, Nova Scotia, and are described and figured 

 by Marsh in the ' Amer. Journ.' ser. 2, vol. xxxiv. p. 1, 

 pi. i. figs. 1, 2 (1862), as belonging to an Ichthyopterygian 

 Eeptile. Presented by Prof. 0. C. Marsh, 1862. 



Family NYRANIIDJE. 



Skull (figs. 39, 40) with the palatines situated near the middle 

 line, internally to the vomers and pterygoids, and the palatine 

 vacuities small and placed far back. Vertebrae (Ichihyerpetum) 

 discoidal. Teeth less complex than in the Anthracosauridce. A 

 ventral armour. 



The type genus was placed by Fritsch with the Archegosauridce, 

 although its resemblance to Anthracosaurus was pointed out • it 

 was subsequently made the type of a family by the present writer 3 , 

 and placed next the Archegosauridce. 



Genus NYRANIA, Fritsch 4 . 



The type genus. Skull (figs. 38, 39) short and wide, with the 

 epiotic cornua directed outwardly, the orbits situated in the hinder 

 half, with a wide interorbital bar ; position of nares unknown ; 

 palate covered with minute denticules ; a tusk-like tooth in each 

 vomer. Known only by the skull. 



Nyrania trachystoma, Fritsch 5 . 



The type and only described species. Length of skull about 

 0,125 (5 inches). 



Hob. Europe (Bohemia). 



1 Amer. Journ. ser. 2, vol. xxxiv. p. 1 (1862). 2 Loc. cit. 



3 In Nicholson and Lydekker's ' Manual of Paleontology,' 3rd ed. vol. ii. 

 p. 1032 (1889). 



4 Fauna der Gaskohle, vol. ii. pt. ii. p. 33 (1885). 5 Loc. cit. 



