﻿PLATE XTII. 



Fig. Page 



1. Osteolepis macrolepulotus, Ag. ; lateral aspect, two-thirds 



nat. size. — Lower Old Red Sandstone; Lethen Bar. 

 a. Anal fin. c. Caudal fin. d v d 2 . Dorsal fins. pet. 

 Pectoral fin. ph. Pelvic fin. [49181.] 370 



2. Thursius plwlidotus, Traq. ; hinder portion of trunk, lateral 



aspect. — Lower Old Red Sandstone ; Caithness. Letter- 

 ing as above. [41361.] 374 



3. Ditto ; ditto. — Lower Old Red Sandstone ; Thurso. 



Lettering as above. [33140.] 375 



4. Megalichthys hibberti, Ag. ; hinder portion of trunk, lateral 



aspect. — Coal-Measures ; Airdrie. v. Vertebral rings. 

 Other lettering as above. [38007.] 383 



5. Megaliclithys coccolepis, Young ; portion of ornament, five 



times nat. size. — Coal-Measures ; Newsham. 



[P. 5494.] 384 



