WILLISTON AND CASE: KANSAS MOSASAURS. 



31 



with indications of emargination. The dorsals are elongated, with 

 transverse faces, and a distinct superior excavation for neural canal. 

 The articular ends of the anterior caudals are vertically oval. 



Length of posterior cervical vertebrae 44 mm. . . . 100 



Vertical diameter of ball 24 .... 54.5 



Transverse diameter 29.5 .... 67 



Length of a dorsal vertebra 52 .... 



O. stenops. 



The anterior caudals possess wide diapophyses. Their articular 

 faces are a vertical oval, a little contracted above, sometimes a 

 straight outline. They present a peculiarly elongate form. 



Length of axis (alone) 60 mm . . . . 100 



Vertical diameter of ball 27 .... 45 



Transverse diameter of ball 27 .... 45 



Length of the mandible 720 .... 100 



Depth at coronoid process 150 .... 20.9 



MEASUREMENTS OF CLIDASTRS WESTII. 



Length of dentary 400 millim. 



Depth opposite the first tooth 20 



Depth opposite last tooth 62 



Entire extent of mandible 630 



Greatest depth at coronoid process 95 



2. Length of axis with odontoid process 80 



Length of axis without odontoid process 70 



Vertical diameter of ball 24 



Transverse diameter of ball ;^^ 



4. Length of fourth cervical vertebra to rim of ball 49 



Expanse of diapophyses 82 



5. Length of fifth cervical to rim of ball 49 



Transverse diameter of ball 35 



Vertical diameter of ball 28 



Expanse of diapophyses 90 



8. Length of eighth vertebra to rim of ball 53 



Expanse of diapophyses 90 



14. Length to rim of ball 54 



Transverse diameter of ball 40 



Vertical diameter of ball 33 



Expanse of diapophyses 100 



18. Length to rim of ball 50 



Transverse diameter of ball 40 



Vertical diameter of ball 36 



Expanse of diapophyses 100 



