EXPLANATION OF PLATE XXVIL 



Fig. 1. Ono ctrvic;il anil fivo iloisal vcrtebrre, with a rib, of Vlatccarpus latispiniis, in place, oue-balf 

 natural size ; from Professor Mudge's collectiou ; profile. 



2. Last cervical and first dorsal, from below. 



3. Last cervical vertebia from front. 



4. Sixth dorsal : a, from front ; b, from below. 



0-10. rititccttrpus iectithis, specimen from Professor Mudge's colled ion from near Sheridan, one-lialf 

 natural size. 



5. Median cervical vertebra from front. 



(■). Median dorsal vertebra : a, centrum, from above; h, from front. 



7. Atlas neurapophysis, from within. 



8. Quadrate bone : a, from outside ; b, from inside ; c, proximal end ol fragment. 



9. Frontal bone, fragment, from above. 



10. Parts of angular aud articular hones with cotylus of mandible. 



11. Third cervical vertebra of Liocloii dyspclor, the Fort Wallace specimen, fiom behind, one-half 



natural size. 



