PLATE X. 
Fig. Pa e e 
1. Cephalaspis murchisoni , Eg., and (A) AucJienaspis 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. Tesserae 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. 1. Inferior lateral scales, v. Ventral 
scales, visceral aspect. [P. 6260.] 189 
5. AucJienaspis 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 
