19G PALAEONTOLOGY 



wider apart than in L. Jaegeri; the nostrils are relatively 

 nearer together, their interspace being only half that in the L. 

 Jaegeri. 



LahyHnthodon (Metopias ) diagnosticus, 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 vide 

 elliptical 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 tin's 

 species are from the upper beds of the keuper sandstone in 

 Wirtemberg. 



The Labyrintliodon (Capitosaurus) arcnaceus, Minister, is 

 distinguished by a much 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 name Zygosaurus appears to have been applied with 

 better grounds, by Eichwald, to a labyriuthodont reptile from 

 the Permian cupriferous beds at Orenburg. It has the para- 

 bolic skull of L. Jaegeri and L. diagnosticus ; the orbits large, 

 and divided by an interval less than their own diameter. The 

 temporal fossa? are relatively larger, and bounded by stronger 

 zygomatic arches, and seem not to have been roofed over by 

 bone. The dentition is strictly labyrinthodont. 



Odontosaurus Voltzii is a genus and species founded by 

 Von Meyer on a portion of a lover jaw, containing fifty tooth 

 lodged in rather a dee]) groove, but apparently presenting the 

 labyrinthic structure. The specimen is from the hunter sand- 

 stone of Soultz-les-Bains. 



Xestorrhytias Pcrrini. — By this name M. von Mover would 

 indicate certain Hat crania] hones, sculptured like those of 



* This generic term hai been applied t<> another fossil by Eichwald. 



