Occasional Papers of the Museum of Zoology 3 



{Paleontographica, Band 36 [1889], pp. 137-58) certain small, per- 

 haps only specific, but notable differences are apparent. The 

 measurements of Frass' specimen are as follows : 



Mm. 



Length of the interclavicle 280 



Breadth of the interclavicle 230 



Length of the clavicle 300 



Breadth of the clavicle 125 



The clavicles articulate with the interclavicle by overlap on the 

 lower side, but the outline of the suture is distinctly angular instead 

 of broadly rounded; the clavicles meet in the median line for a 

 distance of 120 mm.; the coarse reticulate sculpture is restricted to 

 a very small area around the center of ossification. 



So far as may be determined from the thoracic plates alone it 

 appears that the specimen here described may be referred to the 

 genus Metoposaurus, but that they must be placed in a separate 

 species. For this species I take pleasure in proposing the name 

 M. jonesi in grateful acknowledgment of the assistance afforded 

 me by Clifford Jones, manager of the Swenson estate, upon which 

 the specimen was found. 



