XIII. 



PLESIOSAURUS. 



379 



is vaulted. The articular face has a sigmoidal curve ; it measures 

 in length 5-5 inches, in breadth 4-0. 



I 



Diagram CLXXX. Portion of ischia of Plesiosaurus. 



The united bones represented in the diagrams which follow have 

 been in the Museum many years. They are not marked for locality, 

 but certainly are from the stony or septariate bed of Bas^en or 

 Shotover. They have been chipped out of that kind of stone. I 



Diagram CLXXXI. Pair of coracoids. 

 Left-hand figure internal, right-hand figure external view. 



suppose them to be coracoids, meeting in a straight short deep 

 symphysis, behind which is a lacuna (ri). The posterior part is 

 imperfect. I suppose the left-hand figure to exhibit the interior, 

 the right-hand the exterior aspect ; (m) to be the place of the 



