70 



Amphibia Arcliegosaurus, etc. 



^ Wall-case, 

 '3 No. 11. 



The genus Arcliegosaurus, represented by A. Decheni (Gold- 

 fuss), from the Lower Permian " Rothliegendes" of Saarbriick, 

 Rhenish Prussia, is particularly well represented in the Col- 

 lection by a remarkably good series of examples. This genus 

 is confined to the Permian formation, and may be taken as 

 the type of the family. The skull is nearly twice as long as 

 it is broad, with elongate -oval orbits, and situated very far 

 back ; length of skull 11 inches. (See Fig. 93, p. 71.) 



In Actinodon the skull is short and wide, with the. circular 

 orbits placed in the middle of the length ; the nostrils are large 

 and widely separated ; the muzzle is broad. A skull of this 

 species is preserved in the Collection on a slab of shale from the 

 Lower Permian of Autun, Saone-et-Loire, France, and a cast of 

 an entire skeleton from the same locality, presented by Prof. 

 A. Gaudry, is exhibited in the Wall-case. 



Cochleosaurus, Gaudrya, Chelyosaurus, and Sparagmites, are 

 Labyrinthodonts from the Permian Gas-coal of Bohemia, dis- 

 covered and described by Dr. Fritsch, of Prague. Trimerorhachis 

 is from the Permian of Texas. Eryops occurs in Texas, and 

 perhaps also in South Africa. Hhytidosteus is from the Orange 

 Free State (see Table- case, No. 22); and Plwlidogazter from 

 the Lower Carboniferous of Edinburgh. 



FIG. 92. Actinodoi' (atiros/ris (Jordan, sp.). Frontal aspect of the cranium, with the 

 sculpture omitted ; frem the Lower Permian of SaarbrUck. f Pt.F., postfrontal , 

 Pm:r. premaxilla : other letters as in Fig. 86 (p. 66). 



