PLATE 2 



EXPLANATION OF FIGURES 



3 Bones of the floor and lateral wall of the skull viewed from above (Pomolo- 

 bus pseudoharengus). A part of the lateral wing of the frontal bone has been 

 removed to expose the lateral recess; the vertical, posterior part of the exoc- 

 cipital has been cut away to show the floor and side of the saccular recess. X 9. 



4 Bones of the floor and lateral wall of the skull viewed from the median 

 side (Pomolobus pseudoharengus). The articulating surface of the prootic bone 

 (PRO) is in the medial plane; the lateral surface of the basioccipital is shown 

 (BSO) ; the frontal and sjihenotic bones are removed. X 9. 



476 



