dn'P^X" 



B 



GREGORY: FISH SKULLS 



■ pmx ■' 



129 



7/ 2. / 3 y^mxA-/^ 5 / 



pa , . F"* / 



\ dsoc/ 



U. Vss'*' 



Lepidosteus tristoechns 



Fig. 24. Lepidosteus. 

 A. Side view. B. Detail of rostrum. 



B 



pas '< / •proo/ 

 basipt broc 



cufedge "' 



.ootic Met/crsphoi- 



top 



iaiipifiroc ^'-j^ 



Lepidosteus 



Fig. 25. Lepidosteus. 



A. Relations of preopercular and adjoining parts. 



B. Slightly oblique side view of braincase, showing "basipterygoid" facet on parasphenoid and prootic. 



