EXPLANATION OF PLATE XXVIII. 



Cranial and vertebral bones of Liodon dyspelor ami L. proriger, one-half natural sizo. 



Fig. 1. Liodon dyspelor, left maxillary bone. 



2. Left ramus mandibuli, posterior portion: a, surangular; b, articular; c and d, spleuial bones; 



e, articular extremity of angular ; /, articular extremity of splenial. 



3. Coronoid bone, from within. 



4. Cranial bone, ? postfrontal. 



5. Hypapophysis of odontoid: a, from front; b, from back. 



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



7. Hypapophysis of a median cervical vertebra. 



8. Premaxillary and part of maxillary bone of Liodon proriger, in profile. 



9. Premaxillary bono of Liodon proriger, from below. 



