510 SILURIAN TRILOBITES, 



Phacops latigenalis, E. and M. 



Fig. 3. — Cephalic shield slightly distorted; Bowning. Coll. Mitchell. 



Fig. 4. — Portion of another cephalic shield slightly distorted, showing 

 glabella furrows and rounded genal angle; Bowning. Coll. 

 Mining and Geol. Museum. 



Fig. 5. — Another cephalic shield, showing the deep glabella furrows and 

 axial grooves, tumid glabella, wide frontal lobe, and left inter- 

 calary nodule; Bowning. Coll. Mitchell. 



Fig. 6. — Front and under view of cephalon, showing (a) rudimentary 



limb, (6) linear ridge and (c) roof of mouth ; Bowning. ColU 



Mitchell. 



Phacops serratus, Foerste. 



Fig. 7. — Portion of the glabella and thorax; Bowning. Coll. Mitchell. 

 Fig. 8. — Thorax, side view, showing the bluntly spined median line of the 

 segments; Bowning. Coll. Mitchell. 



Phacops Crossleii, E. and M. 

 Fig. 9. — Thorax and pygidium; Bowning. Coll. Mitchell. 

 Fig. 10. — Cephalic shield, with the furrows, eyes, neck ring, intercalary 

 nodules, and rounded genal angles; Bowning. Coll. Mitchell. 

 Fig. 11.— Cephalic shield and portion of thorax; Bowning. Coll. Mitchell. 



Phacops mansfieldensis, E. and M. 



Fig. 12.— Portion of a cephalic shield showing a very tumid and subpen- 

 tagonal glabella, and a strong intercalary furrow, x 2; Mans- 

 field District, Vict. Coll. Sweet. 



Plate XL. 



Hausmannia meridianus, E and M. 



Fig. 1.— Portion of head shield; Kilmore, Vict. Coll. Mining and Geol. 

 Museum. 



Phacops latigenalis, E. and M. 



Fig. 2. — Large cephalic shield distorted, showing the tumid glabella and 

 coarse granulation; Bowning. Coll. Mitchell. 



Fig. 3. — Portion of a pygidium; Bowning. Coll. Mining and Geol. 3Iuseum. 



Fig. 4. — Another pygidium of large dimensions, believed to be that of this 

 species; Bowning. Coll. Mitchell. 



Fig. 5. — Portion of head and thorax; Bowning. Coll. Mitchell. 



