BY It. 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 in situ; Bowning. Coll. 
Mitchell. 
Phacops Sweeti, E. and M. 
Fig. 10. — Central portion of an eye, x 2, Mansfield District, Vict. Coll. 
Siceet. 
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. 
