Number ioi April 9, 1921 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor, Michigan Published by the University 



A NEW- SPECIES OF CERATODUS FROM THE 

 UPPER TRIASSIC OF WESTERN TEXAS 



By E. C. Case 



In the summer of 1920 the author collected a ver\- perfect 

 tooth of the Dipnoan genus Ceratodus from the Dockiuii 

 ( Rhaetic) beds of Crosby County, Texas. This is Number 

 7324 of the University of Michigan Geological collection. 



An examination of the literature shows that this genus has 

 not been previously reported from the Triassic of North 

 America. The tooth is a palatal from the right side and is 

 still attached to its bony base. The outline is triangular with 

 the angle much elevated. There are five denticles with a rud- 

 imentary sixth. The denticles are thin, sharply angular and 

 without crenulations even on the anterior edges. The denti- 

 cles are separated by deep grooves which form deep indenta- 

 tions at the distal edge. The three median denticles extend 

 to the apex of the angle, the first and fifth nearly as far; the 

 imperfect sixth denticle joins the fifth at about its median 



