EXPLANATION OF PLATE XXVI. 



Figures of vertebrae and limb-bones of Pythonomorpha, one-half natural size. 

 Fig. 1. A series of 28 caudal vertebra of an undetermined species, taken from Butte Creek bluffs ; the 

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

 front of it: a, posterior surface of 28th vertebra; b, posterior surface of 24th vertebra; c, 

 posterior surface of the 21st vertebra ; <?, the same, from the front ; e, the 13th, from behind ; 

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

 on separate pieces of rock. 



2. Platecarpua ? mudgei, specimen from Fox Caiion : 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, coronoid 

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



3. Platecarpua mudgei, from Professor Madge's collection, original type : a, hypapophysis of axis, 



from below ; b, hypapophysis of axis, from behind ; c, centrum, or basal part, of atias ; d, 

 articular extremity of scapula. 



4. Middle dorsal vertebra of Platecarpua craaaartua, Cope, from Professor B. F. Madge's collection, 



profile: a, from front. 



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



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



7. Anterior caudal vertebra, from front. 



8. Caudal with diapophysis : a, from behind; 6, from below. 



D. Humerus of Platecarpua craaaartua: 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 extremities. 



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



12. Phalange of same. 



lit. Cervical vertebra of Platecarpua glandiferus, from Professor Mudge's collection : a, from front; 



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

 1 1. Cervical vertebra of the same from Butte Creek : a, from frout ; b, from behind. 



