EXPLANATION OF PLATE XL 



Ijoucs of the same speciiiicu of Protoslega gigas. 



Vic-. 1. Pterygoid anil coliniiellar plate of left side. 



2. ?Auterior part of pterygoid. 



3. Postfroutal boue : a, from inside ; h, from outside. 



4. V^ertebral ceutrum flattened by pressure: a, from above; h, froQi below. 



5. ? Cervical vertebra : a, centrum (flattened) from below ; b, from side ; c, neural arch from side ; 



(?, from above. 



