Amphibia Archeyosaurus, 



71 



FIG. 93.Arehegosaurus Decheni (Goldfuss). Frontal aspect of the cranium, with the 

 sculpture omitted; from the Rothliegendes (Lower Permian) of Saarbruck. About fc. 

 Pmx, premaxilla; MX, maxilla; f? a , nasal; La, lachrymal; Fr, frontal; PF, pre- 

 frontal; Pa, parietal; Ptf, postfrontal; PtO, post-orbital ; Ju, jugal; QJ, quadrato- 

 jugal; Sg, squamosal; flT, supratemporal ; Sp, epiotic ; SO, supraoccipital. (After 

 MialL) 



Fio. 94. A, Left lateral aspect ; B, posterior aspect of a vertebra of Euchirosaurus Roehei 

 (Gaudry). from the Lower Permian of France, n, Neural spine with lateral expan- 

 sions, al; s, suture between spine and arch ; za, prezygapophysis ; zp, postzygapo- 

 physis ; rf, transverse process ; c, rib facet ; cr, neural canal ; ic, intercentrum ; pic, 

 pleurocentra (illustrating the rhachitomous type of vertebra). (Aft.fr Gaudry.) 



