EXPLANATION OF PLATE I. 



Bones of Cionodon arctatus, one-half natural size. 



Fig. 1. Right maxillary bono with teeth : a, viewed from the inner side ; I, from below ; c, from above ; 

 (J, from the proximal end. 



2. Fragment of a cranial bone. 



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



4. Dorsnl vertebra, lateral view : a, from before ; fc, from behind. 



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



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



