EXPLANATION OF PLATE LIV. 



Figures natural size, except fig. 9, which is three-fourths nature 



Fig. 1. Premaxillary and part of maxillary bones of Tellxodus pephredo, Cope, natural size, from the outer 

 side; a, same, from inner side; J, same, from lower side. 



2. Distal end of left dentary bone of the same, outer side, in natural relation with fig. 1. 



3. Distal end of right dentary, from outer side ; a, from above. 



4. Left premaxillary and part of maxillary bone of Encliodus pelrosus, Cope, from the inner side; a, 



same, from outer side. 



5. Distal end of left dentary, from inner side, in relation with fig. 4 ; a, the same, from above. 



6. Base of posterior part of cranium of the same: a, basiiiccipital; h, exoccipital; c, opisthotic ; 



d, pterotic. 



7. Premaxillary and part of maxillary bone of Encliodus dolichus, Cope, from outer side; a, same, 



from below. 



8. Scapula of Pdecopterus chirurgus, exhibiting the facets for articulation of the two large and six 



slender basilar bones. 



