PLATE XII. 



Fig. 



1. Head-shield of a small Euceplialaspis from Forfarshire. The outline agrees with 



that of the little specimen drawn in PI. VIII, fig. 3. 



2. A portion of the cephalic shield of Zcnaspis {Cephalasjns) Salwep, Egerton 



(= Harley), Cornstones, Herefordshire. In the Museum of the 



Geological Survey. The outline woodcut, fig. 2G, has been drawn from a very 

 much finer specimen, which I obtained too late to figure in a plate. For the 

 dorsal scutes of this species see PI. VIII, figs. 2 and 3. 



3. Hemicydaspis [Cejjlialasph) J'/irch/^o/zl = C. ornatus. From the Passage-beds near 



Ludlow. In Mr. Lightbody's collection. 



4. A similar specimen belonging to the Rev. P. B. Brodie. This and the above are 



the specimens figured by Sir Philip Egerton, ' Quart. Journ. Geol. Soc.,' 

 vol. xiii, pi. IX, 1857. 



Compare these two specimens with those from the Ledbury beds, PI. VTII, 



fig. 6, and PI. IX, fig. 1. Their identity is fully proved by the 



ornament. 



5. Cephalas'pis Salwep. Sir Philip Egerton's figured specimen, loc. cit. Cornstones 



of Acton Beauchamp, near Ludlow. Mr. Humphrey Salwey. 



6. A specimen from the same locality, and probably referable to the same species. 



Tlie oblong form and inequality of the tubercles on the surface at one time 

 appeared to me to separate C. Salwei/i from C. asterolepis, but a distinction 

 cannot be maintained on these grounds, since the tubercles are equally irregular 

 in specimens referred to C. asterohpis. This and the more perfect specimen 

 with cornua in the British Museum are rather small specimens of the species. 

 The cornua, which are long and rounded, are not preserved in this specimen. 

 See the woodcut, fig. 2G, page 53. This specimen belongs to Mr. Humphrey 

 Salwey. 



