TABLE II. 



A. 



TRTLOniTES AND A BRACHlOrOn TROJI THE PB.0T0Z01C ROrKS OF TIIK NORTHWIiST. 



Meilal-ruled on Steel, from the Origijiul SpL-cimcn?. 



Talx II. A, Figs. 1, 2, 3. Jlsnphua {Tsolclns) lowensis (N, S.), from a bituminous bed of limestone near the jnnction of F. .^, A, 

 and F. .'!!, B, month of Otter Creek, Turkey River, Iowa. 

 " Fig. 4. Pygidium of the same, showing obscure segments. 



" Fig. 5. Glabella of the same, inadvertently represented inverted by the engraver. 

 " Figs. 6, 7. Compound eye of the same, with a portion of the cephalic shield. 

 " Fig. 8. Pygidium of a new species of Phacops"? from the same bed. 



" Fig. 9. Part of the thoracic segments of Dikelocephalus Minnesotensis, from the Stillwater Trilobite-bed on Lake 

 St. Croix. 



" Fig. 10. Pustulated cephalic shield of an Ilteiius, from Lower Fort Garry, Red River of the North. 

 '■ Fig. 11. Leplcena scricca ? from the Magnesian Limestone of Red River of the North. 



" Fig. 12. Calymene scnaria. This fossil occurs in the shell-beds, F. ^^A, of Wisconsin and Iowa, but the particu- 

 lar specimen here figured was obtained in Ohio, and was selecteil for representation, as well to 

 exhibit a more perfect individual of this sjjecies than any procured in the Northwest, as to test the 

 applicability of the medal-ruling process to subjects of such relief and character. 



