BUPPALO SOCIETY OF NATURAL SCIENCES 



95 



E 1945a 



denticles the margin slopes down to meet the inserted 

 portion of the mandible, producing a conspicuous 

 "shoulder" in the region of these denticles. 



Fragment of a right mandible of about the same size, and 

 showing about as much, as the preceding except that the 

 cutting margin and the denticles are not so well preserved. 



Fig. 31. Imperpect Mandible of an Indeterminate Arthrodire, Probably a 

 New Genus. Nat. Size 

 A, outer view; B, inner. E 1934. 



E 1934 Imperfect small mandible, lacking anterior extremity and 

 the posterior part of the blade portion (fig. 31). The 

 blade portion is demarcated from the functional portion, 

 on the outer face, by a gradual change in level. The 

 functional margin is a cutting edge with a "shoulder" 

 at the point where it joins the inserted portion. The 

 cutting edge is restored in the present condition of the 

 specimen but was intact when the specimen was 

 collected. 



This mandable apparently represents a different genus 

 from the two preceding. No doubt a perfect specimen 



