PRE-JURASSIC TETRAPOUS. 



173 



Super- Family Limnoscelid^e, no v. 



Captorhinomorphs. Brain-case unknown. With primitive 

 limbs, carpus and tarsus only partially ossified. 



Limnoscelis Williston. IT. Coal Measures, New Mexico. 



Super-Family Pantylid^e, nov. 



Brain-case unknown. 



With light neural arches and limbs. 



Pantylus Cope. Artinskian, Texas. 



Super-Order ANOMODONTIA Owen. 



Reptiles with a single temporal vacuity. A short high brain- 

 case with the inner ear placed low down. Supraoccipital very 

 broad. Stapes " articulating with the quadrate. Tabulars and 

 dermo-supraoccipital on occipital surface. In typical forms the 

 lower jaw laterally compressed and with a notched angular. 



Derived from a common ancestor with Captorhinida?. 



Order Caseasauria, nov. 

 Doubtfully belonging to super-order. 



Skull short, with a single laterally placed temporal fossa, sur- 

 rounded by the postorbital, squamosal, ? quadratojugal and jugal. 



Brain-case not well known but apparently considerably different 

 from the normal type of the super-order. Stapes extending 

 nearly to quadrate. Lower jaw showing a projection of the 

 articular on the inner side and perhaps a lateral compression of 

 the angular which may lead on to the typical superordinal 

 arrangement. 



Gasea Williston. Artinskian, Texas. 



? Trispondylus Williston. Artinskian, Texas. 



Order Pelycosauria, 



Anomodonts with the postorbital and squamosal meeting over 

 the temporal fossa, with a screw-shaped glenoid cavity carried by 

 scapula, coracoid, and precoracoid, and primitive limbs. 



Super-Family Poliosaurice Case. 



Pelycosaurs with a straight tooth-row and undifferentiated 

 dentition. A small supratemporal ; stapes articulating with the 

 pro-otic, paroccipital, basioccipital, and basisphenoid round the 

 fenestra ovale only. Cervical neural arches usually heavy and 

 with nearly horizontal zygapophysial facets. 



Varanosaurus Broil i. Artinskian, Texas. 



Varanoops Williston. ,, ,, 



? Poliosaurus Case. „ ,, 



Pmcilospondylus Case. ,, ,, 



? Mycterosaurus Williston. „ ,, 



