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CALIFORNIA ACADEMY OF SCIENCES. 



straight, descending, the width of the head 1^-1| in its 

 length, its depth l|-2 in its length. 



SIS 



Occipital process with a 

 deep constriction where it 

 joins the occiput, shaped 

 like a clover leaflet, much 

 as Ailurichthys panamen- 

 sometimes broader 



than long, sometimes 

 much longer than broad. 



16 



