EXPLANATION OF PLATE XXVI. 



Figures of vertebriB and limb-boues of rijthonomorplia, one-half natural size. 

 Fig. 1. A scries of 23 caudal vertebriB of an undetermined species, taken from Butte Creeli bluffs ; tbe 

 series is continuous except a definite interruption at the 15tli, and two or three possibly in 

 front of it: a, posterior surface of 28th vertebra; 6, posterior surface of 24tU verteljra; c, 

 posterior surface of the 21st vertebra ; cl, the same, from the front ; e, the 13th, from beliind ; 

 /, the 13th, from the front. Many of the neural spines indicated by outliues are preserved 

 on separate pieces of rock. 



2. riatecarpits fjHMfZjei, specimen from Fox Canon : a, posterior part of mandibular ramus from within, 



one-half natural size ; b, posterior part of right dentary, natural size : c, posterior part of left 

 dentary, natural size ; d, coronoid bone, one-half natural size, from the outside; e, corouoid 

 bone, one-half natural size, from the inside. 



3. I'latccarpus muilgci, from Professor Mndge's collection, original type : a, hypapopbysis of axis, 



from below ; b, hypapopbysis of axis, from behind ; c, centrum, or basal ])art, of atlas ; d, 

 articular extremity of scapula. 



4. Middle dorsal vertebra of rialccarpua crassariun, Cope, from Professor B. F. SIndge's collection, 



profile : a, from front. 



5. Adjacent vertebra of same, profile : a, from front ; b, from behind ; c, from below. 



6. Lumbar vertebra: «, from behind; b, from below. 



7. Anterior caudal vertebra, from front. 



8. Caudal with diapophysis : a, from behind ; b, from below. 



9. Humerus of Platecarj)as craasartus : a, from within ; b, from without ; c, proximal end ; d, distal 



end. 



10. Femur of same : a, from within ; b, from without ; c, proximal, and, d, distal exti'eraities. 



11. Fibula of same : a, from side ; b, proximal ; and. c, distal extremities. 



12. Phalange of same. 



13. Cervical vertebra of I'lalecarpns <jland'ifcrus, from Professor Mudge's collection : a, from front ; 



b, from behind ; c, from below ; d, profile. 



14. Cervical vertebra of the same from Butte Creek : a, from front ; b, from behind. 



