Ravmond-Narraway : Notes on Ordovician Trilobites. 59 



12. Balliyiirns loitgispiniis Walcott. A photograph of the type. Somewhat 

 less than natural size. 



13. The same specimen. .\n ubliciue side view to show the profile of the 

 cephalon. 



14. The same species. A drawing of the cephalon and pygidium of the type, 

 with the thorax restored from the crushed segments of the same specimen. Natural 

 size. 



