66 



CALIFORNIA ACADEMY OF SCIENCES. 



straight, descending, the width of the head IJ-lf in its 

 length, its depth 1^-2 in its length. 



Occipital process with a 

 deep constriction where it 

 joins the occiput, shaped 

 like a clover leaflet, much 

 as Ailurichthys panamen- 

 sis, sometimes broader 

 than long, sometimes 

 much longer than broad, 



a 



16 b 



