EXPLANATION OF PLATE I. 



Boues of Cionodon arctatus, oue-half natural size. 



Fig. 1. Right maxillary bone with tcctL : a, viewed from the inner side ; 6, from bulow ; c, from above ; 

 d, from the proximal end. 



2. Fragment of a cranial bone. 



3. Dorsal vertebra, lateral view : a, same from before ; J, from below. 



4. Dorsal vertebra, lateral view : a, from before ; h, from behind. 



5. Caudal vertebra, from the side : a, from the end. 



G. Femur, distal end, antero-posterior view : a and c, lateral views ; &, end view. 



