EXPLANATION OF PLATE XXVIII. 



Cranial ami vortcljral booes of Liodoii di/sjiilor and L. proi-iijcr, oim half natural size. 



Fio. 1. Liodon dyspdor, left maxillary bone. 



2. Left ramus mandibuli, posterior portion: o, surangular; 6, articular; c and d, spleuial boues; 



e, articular extreuiity of angular; /, articular extremity of splcnial. 



3. Corouoid bone, from within. 



4. Cranial boue, ?postfrontal. 



5. Ilypapophysis of odontoid: a, from front; 6, from back. 



f>. Hypapophysis of axis: a, from above; h, from below; somewhat distorted by pressure. 



7. Hypapophysis of a median cervical vertebra. 



8. Preniaxillary and part of maxillary bone of Liodon proriger, iu profile. 



9. Premaxillary bone of Liodon proriger, from below. 



