i68 



NEW YORK STATE MUSEUM 



patience. The species is not common and our specimens represent 

 three cranidia with separated cheeks. The general type of cephalic 

 structure irrespective of the spines is practically that normal to 

 such typical expressions of Lichas as seen in Arges, Ceratolichas, 



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Lichas (Gaspelichas) forillonia 



Hoplolichas and Conolichas, the frontal lobe being large, ovoid 

 and prominent, not set off by deep lateral grooves as in Terataspis 

 but most prominently elevated posteriorly. The lateral lobes are 

 long and narrow, subcrescentic in form and but very slightly ele- 

 vated so that the surface between the dorsal furrows is low, gently 



