THE MICROSAURIAN FAMILY TUDITANID^. 



99 



with the parietals, the anterior extensions of which they inclose. The parietals are 

 large elements and together form a broad oval, truncate posteriorly. They inclose 

 between them the pineal foramen in the median suture. It lies in the posterior 

 fourth of the parietals. The postparietals are elongate transversely, and have the 

 usual relations. The prefrontal is somewhat triangular and forms the anterior 

 boundary of the orbit. The lacrimal has not been detected. The maxilla is elon- 



FlG. 22. 



A. Outline of skull and cranial elements of Erpetosaurus minulus Moodie, from the Cannelton slates of Pennsylvania. 



Original in U. S. National Museum. X 2. /r, frontal; mx, maxilla; par, parietal; po, postorbital; pp, post- 

 parietal; pr, postfrontal; sq, squamosal; spt, supratemporal ; lab, tabulare. 



B. Outline of skull and cranial elements of Erpetosaurus radiatus Cope, from the Coal Measures of Linton, Ohio; 



partially restored. X 0.75. Original in American Museum of Natural History, fr, frontal;7, jugal; ma;, maxilla; 

 n, nasal; or, orbit; par, parietal; pf, postfrontal; po, postorbital; pr, prefrontal; pp, postparietal; pmx, premaxilla; 

 qj, quadratojugal; sq, squamosal; spt, supratemporal; tab, tabulare. 



C. Palate of Erpetosaurus (tabulatus?) , from the Coal Measures of Linton, Ohio. X i. American Museum of 



Natural History, ex, exoccipital; m, mandible; mx, maxilla; pal, palatine; pt, pterygoid; pro, prevomer; pd, para- 

 sphenoid ; *, anterior and posterior palatine vacuities. 



D. Outline of skull and cranial elements of Erpetosaurus acutirostris Moodie, from the Coal Measures of Linton, 



Ohio. Original in American Museum of Natural History. X I. ex, exoccipital ;/r, frontal; j, jugal; mx, maxilla; 

 n, nasal; or, orbit; po, postorbital; par, parietal; pp, postparietal; pf, postfrontal; sq, squamosal; spt, supra- 

 temporal; tab, tabulare. 



E. Outline of larger part of skeleton of Odonterpeton triangularis Moodie, from the Coal Measures of Linton, Ohio. 



Original in U. S. National Museum. X 4. h, humerus; il, ilium?; v, vertebrae, all of which are not represented. 



F. Right mandible of Erpetosaurus tabulatus Cope, from the Linton, Ohio, Coal Measures. Original in American 



Museum of Natural History. X 2. art, articular; cor, coronoid; d, dentary; ang, angular; sa, surangular. 



G. Skull elements and lateral-line canals of Erpetosaurus tabulatus Cope, from the Coal Measures of Linton, Ohio. 



X 1.5. fr, frontal; j, jugal;77, jugal lateral-line canal; mx, maxilla; n, nasal; or, orbit; par, parietal; po, postorbital ; 

 /)/, lacrimal or prefrontal ; io, suborbital lateral -line canal; pp, postparietal; pmx, premaxilla; 5 j, quadratojugal; 

 spa, supraorbital lateral -line canal; sq, squamosal; spt, supratemporal; tm, temporal lateral-line canal; tab, tabu- 

 lare; so, supraoccipital cross-commissure of later^-Hne canal. 



