128 



Proceedings of the Royal IrUh Academy. 



Phacops mucronatus Brong. Tigs. 10-13. 



10. Cephalic shield, showing glabella and free cheeks. 



Tirnaskea lliver. 



11. Less perfect specimen, showing glabella and free cheeks. 



Tirnaskea Elver. 



12. Fragment of large cephalic shield, showing portion of glabella 



and eye. Tirnaskea Eiver. 



13. Pygidium. Tirnaskea River. 



^glina rediviva Earr. Figs. 14-16. 



14. Pygidium of small individual. Tirnaskea Eiver. 



15. Pygidium of large individual. Tirnaskea Eiver. 



16. Nearly perfect small individual, somewhat contorted. 



Tirnaskea Eiver. 



