216 PALEONTOLOGY. 



maxillo-palatine foramina as in the frog and toad : behind 

 these are the inner apertures of the nostrils ; and then follow 

 a pair of unusually large pterygo-palatal vacuities. 



Labyrinthodon (Metopias*) diagnosticums, H. von M. — In 

 this species the skull is broader in proportion to its length 

 than in the foregoing ; the sides are convex as they converge 

 to the obtuse muzzle. The orbits are small, of a wide ellip- 

 tical form, situated in the anterior third of the skull ; they 

 are twice as wide apart as are the nostrils. The parietal 

 foramen is near the occipital ridge. The remains of this 

 species are from the upper beds of the keuper sandstone in 

 Wurtemberg. 



The Labyrinthodon (Cajoitosaurus) arenaceus, Munster, is 

 distinguished by a broader and almost truncate muzzle. The 

 orbits are elliptic, and situated almost wholly in the hinder 

 third of the cranium; their interspace is the same as that 

 between the nostrils, which are relatively as large as in L. 

 Braunii. The premaxillo-palatine foramina are blended into 

 one transversely oval foramen. 



The name Zygosaurus was applied by Eichwald to a laby- 

 rinthodont reptile from the Permian cupriferous beds at Oren- 

 burg. It has the parabolic skull of L. Jaegeri and L. diag- 

 nosticus ; the orbits are large, and divided by an interval less 

 than their own diameter. The temporal fossse are relatively 

 larger, and bounded by stronger zygomatic arches, and seem 

 not to have been roofed over by bone. The dentition is 

 strictly labyrinthodont. 



The Labyrinthodon Bucklandi, Lloyd, is from a sandstone, 

 near Kenilworth, regarded by Professor Eamsay as of Permian 

 antiquity. 



Odontosaurus Voltzii is a genus and species founded by 

 von Meyer on a portion of a lower jaw, containing fifty teeth 

 lodged in rather a deep groove, but apparently presenting the 



* This generic term has been applied to another fossil by Eichwald. 



