4 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA. 



PACE 



Systematic descriptions (continued] -. 



Mixosaurus 94 



M. cornalianus . 95 



Vertebral column 96 



Ribs 98 



Extremities 99 



Limb arches 101 



Skull 102 



Dentition 103 



Classification 1 03 



Cymbospondylus 103 



C. petrinus 104 



Skull 105 



Dentition Ill 



Vertebral column Ill 



Ribs 118 



Pectoral arch 119 



Pectoral limb 119 



Pelvic arch 120 



Pelvic limb '. 120 



C. piscosus 123 



C. nevadanus 124 



Toretocnemus ; 127 



T. calif ornicus 1 28 



Merriamia 129 



M. zitteli 129 



Delphinosaurus 131 



D. perrini 131 



Shastasaurus 137 



S. osmonti = 13g 



S. alexandrae 142 



S. pacificus 143 



S. altispinus 



S. careyi 



Mixosauridae of uncertain position 14g 



Cymbospondylus ( ?) nordenskioldii 14g 



Cymbospondylus ( ?) polaris 149 



Cymbospondylus( ?) natans 150 . 



Ichthyosaurus , r- 9 



I. carinatus 



I. (?) rheticus 



I. (?) hectori 



I., sp. 



Errata 156 



Explanation of plates ... ,,- Q 



T , -108 



Index 193 



