EXPLANATION OF PLATE L. 



Figs. 1-4. I'achyrhizodus caiihius, Cope, natural size. 



Fig. 1. The mandibular rami, the right one with the angul-jr bone entire behind, and broken in frout ; 

 the left with the angular process broken oft'. 



2.~The right angular, viewed from the, outer side. 



X The right premaxillary bone, inferior aspect ; 3 a, viewed from the outer side. 



4. Eight maxillary, inuer side : 4 a, same, from above. 



5. Distal part of dentary bone of Fachyrluzodus latimcnlum, Cope, from outer side. 



b'. Premaxillary bone of Ichthyodeclcs multio'eiitatiis, Cope, from within ; 6 a, same, from without. 



7. Part of the maxillary bone of the same. 



8. End of dentary bone of Empo ncpaolica, Cope. 



All the figures on this plate are of the natural size. 



