PLATE VIII. 



Eucephalaspis {Cephalaspis) Lyellii ; the specimen figured by Agassiz, ' Poissons 

 fossiles,' pi. i, fig. I, 1835, now in the British Museum. The artist has 

 introduced the indications of pectoral appendages which were broken away in 

 exposing the series of marginal scales. Glammis, Perthshire. Compare the 

 direction of the scales in this and in PI. XI, fig. 1 . 



A specimen of a scute, not forming part of the cephalic shield, and proved by its 

 ornamentation and occurrence to belong to Zenaspis {Cephalaspis) Salweyi 

 {=z asferolepis). Cornstones, Herefordshire. In the Museum of the 

 Geological Survey. 



Another^ similar scute. Cornstones, Herefordshire. In the Museum of the 

 Geological Survey. 



A somewhat similar fragment of doubtful character, but showing well the orna- 

 mentation as an intaglio. Cornstones, Herefordshire. 



A small Cephalaspis from Herefordshire, showing the body in a rather fragmentary 

 condition, which the artist has failed to render. In the collection of Mr. 

 Morton, of Liverpool. 



Hemicyclaspis {Cephalaspis) Murchisoni ; a fine specimen of the head-shield from 

 the Passage-beds of Ledbury, Herefordshire. In the collection of Dr. 

 Grindrod. 



