XVI SYSTEMATIC INDEX. 



Family PLESIOSAURID^E (continued). 



Page 



Plesiosaurus rostratus 271 



sp 274 



costatus 282 



bitractensis . 283 



Family LAEIOSAUEID^E 284 



Lariosaurus balsami 284 



Neusticosaurus pusillus 285 



Family NOTHOSAURID^E 287 



Pistosaurus longaevus 287 



Nothosaurus mirabilis 288 



giganteus 293 



Conchiosaurus clavatus 295 



List of Triassic Sauropterygia not mentioned above . 299 



Family MESOSAURIDJ3 300 



Mesosaurus tenuidens 300 



tumidus 302 



