122 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA. 



Compared with the posterior limb of Mixosaurus, the available specimens 

 representing the limb of Cymbospondylm may be considered, so far as known, 

 to represent nearly the same stage of evolution as the hind limb of Mixosaurufi. 



MEASUREMENTS OP LIMB AND ARCH ELEMENTS, SPECIMEN 9950. 



Humerus. 



Greatest length 325 nun. 



Greatest transverse diameter of distal end 200 



Least transverse diameter of median region of shaft 133 



Radius. 



Greatest length 200 



Greatest transverse diameter of proximal end 14:i 



Greatest transverse diameter of distal end 160 



Least transverse diameter of median region of shaft 83 



Ulna. 



Greatest length 185 



Greatest transverse diameter of proximal end 121 



Least transverse diameter of median region of shaft 95 



Coracoid. 



Greatest anteroposterior diameter 312 



Greatest transverse diameter 246 



Scapula. 



Greatest anteroposterior diameter 357 



Greatest width of distal end of posterior blade 195 



Ilium. 



Greatest length 205 



Ischinm. 



Greatest anteroposterior diameter 200 



Greatest transverse diameter 1 75 



Pubis. 



Greatest transverse diameter, approximately 126 



MEASUREMENTS OP POSTERIOR ARCH AND LIMB ELEMENTS OF SPECIMEN 9947. 



Femur. 



Greatest length 255 mm. 



Transverse diameter of proximal end, parallel with flattened distal 



surface 117 



Transverse diameter of distal end. parallel with flattened surface 170 



Transverse diameter at narrowest portion of median region, parallel 



with flattened distal surface 83 



Transverse diameter of tibial facet .. 152 



