THE THALATTOSAURIA 



A (ji-oui) of Marine Reptiles 



FKOM THK 



Triassic of ( 'alifoniia. 



By 



JOHN C. MERIUA.M. 



('0NTENT8. 

 I'l.ATKs i-vrrr. 



Introduction 8 



Ordinal and Family ('HARAcrKus 5 



Occurrence and Age 5 



Materials Available 7 



(Ienehal Skeletal STurcTCKE S 



Skull ; 8 



Facial Jiet/ion 8 



Front o-parietal Region 10 



Temporal Region 11 



Qiiadrute, Suspensorinni 12 



Orbital Region 12 



Palatine Region lo 



Mandilile 15 



Dentition Id 



(Inalliir 15 



]'omerine 17 



Pterygoid 18 



Fv net ion 18 



Vertol)i;u" 18 



Ribs l!l 



Trve Rihx li» 



Alnhnninal Rihn li) 



( 1 ) May •">, 1»). 



Ml 



