PLATE XIII. 
Pig. Page 
1. Osteolcpis macro!epidotus, Ag. ; lateral aspect, two-thirds 
nat. size.—Lower Old Pted Sandstone; Lethen Bar. 
a. Anal fin. c. Caudal fin. d v d 0 . Dorsal fins. pet. 
Pectoral fin. plu. Pelvic fin. [49181.] 370 
2. Thursius pholidotus, Traq.; hinder portion of trunk, lateral 
aspect.—Lower Old Bed Sandstone ; Caithness. Letter¬ 
ing as above. [41361.] 374 
3. Ditto; ditto.—Lower Old Bed Sandstone; Thurso. 
Lettering as above. [33140.] 375 
4. Megcdichthys hibberti, Ag.; hinder portion of trunk, lateral 
aspect.—Coal-Measures ; Airdrie, v. Vertebral rings. 
Other lettering as above. [38007.] 383 
5. Megalichthys coccolepis, Young; portion of ornament, five 
times nat. size.—Coal-Measures; Newsham. 
[P. 5494.] 
384 
