EXPLANATION OF PLATE XLVI. 



Figs. 1-4. Ichihyodectcs ctenodon, Copo, natural size. 

 Fig. 1. Maxillary bono, from tbe outside. 



2. Dentary bone, from tbe inside. 



3. Hyomandibular bone. 



4. Cervical vertebra. 



5. Ichthyodectes hamatus, Cope, natural size: 6, premaxillary and maxillary bones, from tbe outer 



side ; 5 a, mandibular ramus, from the outer side. 

 Figs. 6-10. Ichthyodectes jyrognathus, Cope : C, tbe premaxillary, with anterior extremity of maxillary, 

 from tbe inner side ; 6 a, same, from the outer side ; natural size. 



7. Ventral spine accompanying tho same, natural size. 



8. Cervical vertebra?, one-ball natural size. 



9. Dorsal vertebra?, one-half natural size. 



10. Terminal caudal vertebras, with articulating spines ; one-half natural size. 



11. Maxillary bono of Pachyrhhodus kingii, from tbe inner side, natural size. 



12. Three vertebra? of Anogmius, largest 6pecies, accompanying remains of IchthyocUxles ctenodon, 



one-half natural size. 



13. Cervical vertebra? of a ? Portheus, one-half natural size. 



