PLATE V. 
Pig. p ag'e 
1. Asterolepis maxima (Ag.) ; anterior median dorsal plate, 
visceral aspect, one-third nat. size, showing overlapping 
facettes (ov.). —Upper Old Led Sandstone; Nairn. 
[38710.] 206 
2. Pterichthys milleri , Ag. ; cranial shield, visceral aspect.— 
Lower Old Eed Sandstone : Lethen Ear. l.occ. Lateral 
occipital, m.occ. Median occipital, o. Orbital (? sclero¬ 
tic) plate. p • Pineal ( u os dubium ”). pt.m. Post¬ 
median. [49187.] 213 
3. Ditto ; dorsal aspect.—Ibid, a.cl.l. Anterior dorso-lateral. 
a.m.d. Anterior median dorsal, a.v.l. Anterior ventro¬ 
lateral. d. Dorsal fin. e.l. Extralateral (operculum). 
f. Caudal ridge-scales, mn. Mental, p.d.l. Posterior 
dorso-lateral. p.v.l. Posterior ventro-lateral. 
[50109.] 213 
4. Ditto; ventral aspect.—Ibid. ar. Articular, mv. Median 
ventral. Other letters as above. [50110.] 214 
5. Ditto; trunk and tail, lateral aspect.—Lower Old Eed 
Sandstone ; Gamrie. p.m.d. Posterior median dorsal. 
Other letters as above. [P. 4036.1 215 
6. Ditto ; operculum or extralateral plate, visceral aspect.— 
Lower Old Eed Sandstone; Tynet Burn. [35981.] 215 
7. Ditto ; anterior median dorsal plate, outer aspect, showing 
overlapped postero-laterul border.— Ibid. [35980.] 215 
8. Pterichthys testudinarius , Ag.; dorsal aspect of head, ven¬ 
tral aspect of trunk.—Lower Old Eed Sandstone; 
Lethen Bar. Z. Lateral, pm. Premedian. Other let¬ 
ters as above. [49190.] 216 
9. Pterichthys productus , Ag.; ventral aspect of trunk.— 
Ibid. Lettering as above. [P. 534.] 217 
10. Pterichthys oblongus, Ag.; distal portion of append¬ 
age.—Ibid. a. Anconeal, c. Central, m. Marginal. 
t. Terminal. ( 39174.] 220 
