PLATE XI. 



1. Eucephalaspis [Cephalaspis) Lyellii. Lateral view of the specimen from near 



Arbroath, Forfarshire, now in the Arbroath Museum. The head is not well 

 preserved, nor is the material of the scales ; but their order, and the pectoral, 

 dorsal, and caudal fins are admirably displayed. 



2. The same specimen, with a fragment of the body removed, displaying thus the 



ventral series of scales. The two pectoral appendages are well seen in this 

 drawing, but the artist has introduced a joint-like structure in the right-hand 

 appendage, which cannot be justiBed from the specimen itself. Compare the 

 pectoral appendages of this specimen with those of Eu. Poicriei, PI. X, fig. L 



3. Caudal fin of a Cephalaspis, ft-om the same bed which contains Emeplialaspis Pagei, 



Eu. asper, and perhaps another species. Reswallie, Porfar. Mr. Powrie's 

 collection. 



4. A small specimen of C. Pagei, with the head so crushed as to give the cornua an 



increasedly incurved appearance. 



