EXPLANATION OF PLATE XL. 



Porlheus moJossits, one-half natural size, from tbe type-specimen (See Plate ssxis). 

 Fig. 1. Mandibular ramus, from tbe inner side. 



2. Palatine bone, with malleolar body, from above ; 2 a, from the outer side. 



3. Sclerotic ossifications from the outer side ; 3 a, from inner side. 



4. ? Hyomandibular from the outer side ; 4 a, from the inner side. 



5. Quadrate bone, including the symplectic. 



6. Preoperculum. 



7. ?Intcropcrculum. 

 FlCS. 8-9. Uncertain bone 



