EXPLANATION OF PLATE XXX. 



Vertebra; of L'uxlon (lijspclor, from Butte Creek, and L. prorigei; type-specimen, one-half natural size. 



Fig. 1. Third cervical vertebra of Z. chjspdor, from below. 



2. Fifth cervical vertebra, from behind ; slightly distorted by pressure. . 



3. Middle cervical, from behind. 



4. Last cervical : a, from behind ; b, from below. 



5. Anterior dorsal vertebra: a, from front; ft, from rear, 

 (i. Middle dorsal, centrum from behind. 



7. Posterior dorsal, centrum from behiud. 



8. Posterior dorsal or anterior lumbar: a, from behind ; b, from below. 



9. Three consecutive lumbar vertebrae, from below. 



10. Corvical vertebra of Liodon proriger, from the front; belonging with the remaining figures to 



fig. 14, inclusive, to the type-specimen in the Museum of Comparative Zoology, Cambridge. 



11. Anterior caudal vertebra of the same individual, from behind. 



12. Median caudal : a, from front ; b, from the side. 



13. Posterior caudal vertebra : a, from front ; b, from side. 



14. Four distal caudals, profile. 



