240 



On the Genus Lysorophusj Cope. 



P.Fr. 



Art. 



A B 



Transverse sections of skull of Lysnrophus, to show the sphenethmoid and 

 u alisphenoid " bones. 



A. Sphenethmoid: /•'/•., frontal ; Pa.S., parasphenoid ; P.Fr., prefrontal ; 

 Ft., pterygoid ; S]>.E., sphenethmoid. B. " Alisphenoid" {'A.S.'): 

 Art., articulare of lower jaw ; Fa., parietal ; Qu., quadrate. 



Fig. 5. 



- Sp. E. 



A.S. 



- Pr. At. 

 Three horizontal sections superposed. 



Vo., vomers ; Fr.Ot., pro-otic ; $q., squamosal ; S.o.. supra-occipital ; 

 E.o., exoccipital ; Tab., tabulare ; Pr.At. f pro-atlas. 



