﻿PLATE X. 



Fig. Page 



1. Cephalaspis murchisoni, Eg., and (A) Auchenaspis egertoni. 



Lank. ; group of several individuals. — Lower Old Red 

 Sandstone Passage Beds ; Ledbury. I.— III. Principal 

 specimens mentioned in description, x. Operculum, 



[P. 6023.] 189 



2. Cephalaspis murchisoni, Eg. ; imperfect shield showing 



ventral dermal plates, visceral aspect. — Ibid. d. Internal 

 cast of dorsal shield, d.t. Tesserce of dorsal shield. 

 v.r. Inferior rim of shield, v. t. Tessellated dermal plates 

 of ventral surface. [P. 6108.] 189 



3. Ditto ; portion of tubercular ornament of shield, four times 



nat. size.— Ibid. [P. 6109.] 190 



4. Ditto ; portion of squamation of trunk. — Ibid. d.l. Dorso- 



lateral scales. I. Inferior lateral scales, v. Ventral 

 scales, visceral aspect. [P. 6260.] 189 



o. Auchenaspis egertoni, Lank. ; dorsal aspect. — Ibid. [Speci- 

 men marked A in fig. 1.] [P. 6023.] 197 



6. Ditto ; external aspect of dorsal shield, showing tubercles. — 



Ibid. [P. 6112.] 197 





