20 



and not giving origin to a strong ridge on the side of the cen- 

 trum, as is seen in the species of Scapherpeton. Neither is there 

 any fossa on the side of the centrum as in that genus. There is a 

 small longitudinal foramen which enters the inner base of the in- 

 ferior half of the diapophysis. There is a low ridge on each side 

 of the neural arch, which extends backwards and inwards. The 

 anterior articular face is a wide oval somewhat contracted below, 

 and is pierced bj r a foramen at a point within the superior third 

 of the vertical diameter. It is not so deeply excavated as in the 

 species of Scapherpeton. The posterior articular face is a regular 

 vertical oval, is concave, but not excavated, as is seen in the centra 

 of the genus just mentioned. The inferior face of the centrum is 

 rounded, with some feeble lateral ridges. 



Measurements. m. 



/longitudinal 0070 



Diameter of centrum < vertical 0050 



'transverse . . . . .0040 



Total elevation at middle 0090 



Expanse of posterior zygapophyses 0070 



diapophyses 0095 



About the size of the Menopoma allegheniense. 



This batrachian is dedicated to Prof. D. S. Jordan, of the North- 

 western Christian University, author of the Manual of the Ver- 

 tebrate/, of the Eastern United States. 



Published January 10, 1877. 



