Foi7it Levi Fossils. 



307 



SiLURiA, plate 3, fig\ 2, representing the sub-marginal fold of the 

 cephalic shield, and the hypostoma attached thereto of Ogygia 

 Buchii, the structure of the head of Ogygia must be the same as 

 that of Dikelocepkalus. The affinities of the two genera are 

 still further indicated by the form of the glabella. 



DiKELOCEPHALUS MAGNIFICUS. 



Figure 5. 

 Fig. 5. — Glabella and pygidiutn of D. magnificus. 



Description. — Eight or nine inches in length. Head large 

 with a short broad obstusely conical depressed convex glabella 

 in front of which there is a broad flat margin with from five to 

 eight obscure radiating ridges. The neck furrow is represented 

 by an obscure shallow groove which is visible in the middle two 



