﻿PLATE V. 



Fig. Page 



1. Asterolepis maxima (Ag.) ; anterior median dorsal plate, 



visceral aspect, one-third nat. size, showing overlapping 

 facettes (ov.). — Upper Old Eed Sandstone ; Nairn. 



[38710.] 206 



2. Pterichthys milleri, Ag. ; cranial shield, visceral aspect. — 



Lower Old Eed Sandstone ; Lethen Ear. I.occ. Lateral 

 occipital, m.occ. Median occipital, o. Orbital (? sclero- 

 tic) plate, p. Pineal (" os dubium"). pt.m. Post- 

 median. [49187.] 213 



3. Ditto ; dorsal aspect. — Ibid, a.d.l. Anterior dorso-lateral. 



a.m.d. Anterior median dorsal, a.v.l. Anterior ventro- 

 lateral, d. Dorsal fin. el. Extralateral (operculum). 

 /. Caudal ridge-scales, mn. Mental, p.d.l. Posterior 

 dorso-lateral. p. v. I. 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.] 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-lateral border. — Ibid. [35980.] 215 



8. Ptericlithys testudinarius, Ag. ; dorsal aspect of head, ven- 



tral aspect of trunk. — Lower Old Eed Sandstone; 

 Lethen Bar. I. 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 



