Skeleton of LEPibosTEiiS. 



iif 



process attached to the parasphenoid. In front of the orbital 

 region the parasphenoid is V-shaped in transverse section, the 

 ascending laminae overlapping the pi-^emaxillaries in front and 

 descending laminse of the frontals behind, with the latter 



Text-fiffure 2. 



Lepidosteus platystomtts. Ski;ll from above and from below ; tbe ptervgo-qnadrate, 

 suspeusorium, opercles, etc., of one side removed. 



eth. mesetlimoid; n. nasal; n.' adnasal; p»»,r. prsemaxillary ; nix. maxil- 

 larj' ; /. frontal ; p. parietal ; pto. pterotic ; spo. sphenotic ; epo. epiotic ; 

 pro. pro-otic ; doc. dermo-occipital ; eoc. esoccipital ; hoc. basioccipital ; 

 ptte. post-temporal; psp. parasplienoid ; v. vomer; pal. palatine; ect. ecto- 

 ptorygoid; ent. entopterygoid ; mt. metapterygoid ; q. quadrate; corh. cir- 

 cumorbital ; cp. operculum ; sop. suboperculum ; iop. interoperculum ; pop. 

 pra;operculum. 



enclosing a chamber that contains the posterior part of the 

 rostral cartilage. This does not completely fill the chamber, 

 but on each side there is a channel for the passage of the 

 olfactory nerves (text-fig. 3). 



