BY R. ETHERIDGE, JUNR., AND JOHN MITCHELL. 511 



Fig. 6. — Young specimen— portion of cephalic shield, with linear glabella 

 furrows; Bowning. Coll. Mitchell. 



Phacops serratus, Foerste. 

 Fig. 7.— Portion of cephalic shield; Bowning. Coll. Mitchell. 

 Fig. 8. — Portion of another cephalic shield, tumid glabella, and neck 

 tubercle; Bowning. Coll. Mitchell. 



Phacops latigenalis, E. and M. 



Fig. 9. — Rostral shield with the hypostome m situ; Bowning. Coll. 

 Mitchell. 



Phacops Sweeti, E. and M. 



Fig. 10. — Central portion of an eye, x 2, Mansfield District, Vict. Coll. 

 Sweet. 



Phacops serratus, Foerste. 



Fig. 11. — Side view of the cephalic shield, with the neck spine prominently 

 shown. 

 All the figures, unless otherwise indicated, are of the natural size. 



