MOODIE: PERMIAN ANPHIBIA. 243 



sphenoid well developed or reduced ; teeth on pterygoids, pala- 

 tines, prevomers and parasphenoid. 



Range. Upper Pennsylvanian to Permian. 



Distribution. America, Europe, Asia. 



Genus — Eryops Cope, 1877. 



The following definition of the genus is given by Doctor 

 Branson: "Skull long, comparatively narrow; proportion of 

 length to breadth about nine to seven. Roof bones coarsely 

 sculptured posteriorly, finely sculptured anteriorly. Nasals 

 and premaxillae very large; frontals excluded from orbits by 

 junction of pre- and post-frontals. Pterygoids not meeting in 

 the median line; parasphenoid dagger-shaped, tapering grad- 

 ually to a point just in front of the palatine foramina; pre- 

 vomers large. Orbits subcircular, situated in the posterior half 

 of the skull ; nares subovate, remote, at a considerable distance 

 from the tip of the skull. Many minute denticles on pterygoids, 

 palatines, prevomers and parasphenoid. Teeth circular in 

 cross section, strongly ribbed near base, dentine strongly in- 

 folded. Three large teeth on each palatine. Mandible without 

 postcotyloid process. Vertebrae rachitomous. Ribs double- 

 headed. Pelvic bones coalesced." 



There have been up to the present five species of Eryops de- 

 scribed, with a doubtful sixth, ? Eryops platypus Cope, from 

 the Carboniferous of Ohio. 



In 1889 Lydekker described a species of Eryops, E. africanus, 

 from the Karoo beds of South Africa. Broom has subse- 

 quently shown that this species does not belong in this genus 

 and has placed that species with two others in his genus 

 Rhinesuchus, in which he includes R. (Macromerion) gumbeli 

 (v. Ammon), R. (Eryops) africanus (Lydekker), and R. 

 whaitsi Broom. 



An additional species of Eryops is represented by remains 

 in the collection of the University of Kansas and it is here 

 described as new. 



Eryops willistoni, new species. 



Dr. S. W. Williston in 1899 described and partially figured 

 m the Kansas University Quarterly portions of a skeleton of 

 a species of Eryops, which he tentatively referred to the 

 species Eryops megacephaliis Cope. He has several times 

 expressed to me the opinion that the form is distinct from 

 E. megacephalus, and a recent careful study of the ma- 



