494 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 39. 



Measurements of the skull fragment of Erpetosuchus kansensis Moodie {Cat. no. 6699, 



U.S.N. M.). 



mm. 



Length of portion preserved 109 



Maximum width of maxilla 45 



Thickness of maxilla 7 



Length of tooth 10 



Width of tooth at base 4 



Measurements of the left ramus of the mandible of Erpetosuchus kansensis Moodie (Cat. 



no. 6680, U.S.N.M.). 



mm. 



Total length of the jaw as preserved 305 



Greatest width 79 



Least width 24 



Length of angular 132 



Width of angular 45 



Length of largest tooth 10 



Width of largest tooth at base 6 



Length of most posterior tooth 6 



Width of most posterior tooth at base 4 



Length of anterior internal mandibular foramen 56 



Greatest width 15 



Least width 7 



Length of posterior internal mandibular foramen 77 



Greatest width 28 



Least width 14 



Length of bridge 16 



Width of bridge 8 



RIBS. 



There are portions of two dorsal ribs preserved on the block of 

 coal with the skull. These show characters very similar to those 

 exhibited by the rib ascribed to MacreriMon Jiuxleyi (Cope), and 

 also those of Metopias diagnosticus von Meyer, and Anaschisma. 

 The ribs are solid, heavy, curved, and have a longitudinal groove 

 on the middle of each side. The heads of the ribs in the present 

 specimen are obscured and nothing can be said of them except that 

 they appear to be large. 



Measurements of ribs of Erpetosuchus kansensis Moodie. (Cat. no. 6699, U.S.N.M.). 



mm. 



Length of preserved portion 130 



Width at distal end 18 



Thickness of rib 5 



RELATIONSHIPS. 



The new form finds its nearest relationships with the members of 

 the family Labyrinthodontida3 as used first by Hermann von Meyer 

 in 1842,« and by Zittel in 1887,^ and as correctly redefined and 



a N. J. Mineral., p. 301. b Handbuch Paleon., vol. 3, p. 401. 



