EXPLANATION OF PLATE XXX. 



VertebriB o{ Liodon dyspeJor, from Butte Creek, and L. prorigcr, t.vpe-speciiueii, oue-balf uatiiial size. 



Fig. 1. Third cervical vertebra of i. (lyspelor, from below. 



2. Fifth cervical vertebra, from behiud ; slis^htly distorted by iiressure. 

 ;!. Middle cervical, from behind. 



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



5. Anterior dorsal vertebr.a: a, from front; h, from rear, 

 fi. Middle dor.sal, centrum from behind. 



7. Posterior dorsal, centrum from behind. 



8. Posterior dorsal or anterior lumbar : a, from behind ; 6, from below. 



9. Three consecutive lumbar vertebras, from below. 



10. Cervical vertebra of Liodon pro>ig(n; from the front; belonging with the remaining tigiues 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. 

 1'3. Median caudal : a, from front; i, from the side. 



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



14. Four distal caudals, profile. 



