PLATE IX. 



Fig. 



1. Head-shield of Hemicyclaspis {Cephalaspis) Murckisoni, showing well its posterior 



margin and the angle of the shield on the left side. Passage-beds, Led- 

 bury. Dr. Grindrod. (See also PI. I, fig. 6, and PI. XII, figs. 3 and 4.) 



2. EucepJialasjois [CepJiala-'^pis) Jz/assizii ; a head-shield from the Cornstones of 



Herefordshire, which has not been crushed. The part of the cornu which is seen 

 is not its upper, but its lower Avail. Mr. Lightbody, of Ludlow. 

 8. Ell. Jffassizii ; a head-shield, exhibiting a more complete outline than fig. 2, but a 

 little crushed, whence the more ovoid and smooth contour which it presents. 

 Cornstones, Cradley. Dr. Grindrod. 



4. A rim of a Cephalaspidian shield, perhaps Hemicyclaspis MurcJdsoni. Passage-beds 



of Ledbury. Dr. Grindrod. 



5. A large head-shield of Eucephalaspis Poioriei. The very great breadth of the 



shield is due to the flattening by pressure to which the fossil has been exposed; 

 making allowance for this, the form of the cornua and the relative size and 

 position of parts of the shield may be contrasted with those in the neigh- 

 bouring figures. Mr. Powrie. 

 (). EueepJialasjns Agassizii ; a head-shield showing well the relative size of the cornua, 

 anterior position of the orbits, and form of the posterior median prolongation of 

 the shield. Compare this and figs. 2 and 3 ; their differences are simply due to 

 different pressure and preservation. Cornstones. Dr. Grindrod. 



