EXPLANATION OF PLATE LL 



Figs. 1-7. Pachyrhizodus latimentum , Cope, three- fourtlis of uatiiial size. 



Fig. 1. Both manclibular rami, the upper without articulo-nngular bone ; the lower with the upper edge 



downward, and the distal end of the deutaiy wanting; 1 a, syuipliyseal extrenjity of the 



left dentary ; 1 h, probable accessory maxillary bone. 



2. Supposed pre6rl>ital bone. 



3. Element of uncertain position. 



4. Supposed hyomandibular ; ou the same block as the next — fig. 



5. Supposed interoperculum. 



(i. Uncertain piece, perhaps symplectic. 



7. Lateral view of a vertebra accompanying the same. 



8. Pachyrhizodus leptopsis, Cope, mandil>ular ramus, natural size: o, distal half of dentary bone, 



from within ; fc, proximal part of the same bone ; c, vie w ( f distal or s^ mphyseal end of the 

 Bame. 



