Dice. 



198 



Dicellocephalus hartii. See on page 199. 

 Dicellocephalus minnesotensis. Owen. Geol. Wis. Iowa 





^, 



»>«' 





>^>' 



.^ 



\ 



Ow. D. m. 



y 



and Minn. 1852, pi. 1, fig, 1, to sl.ow form and size ; pi. 2, fig. 

 1, to show embedment in a hand specimen, "fifth trilobite 

 bed," St. Croix river, Stillwater, Minn. — Potsdam^ I. 



