98 EXPLANATION OF THE PLATES. 
GLYPTO-DIPTERINI. 
Gig. 5.—a, b. GLYPTOLEPIS LEPTOPTERUS, Agassiz. 
Poiss. Foss. Grés. Rouge, p. 63, plates xx. et xxi. 
a, b. From figs. 1 and 5, pl. xx. of the work cited. 
a. Under surface of head, reduced to one-fourth of natural size, from fig. 4, 
pl. xx. 0b. Scales (cycloidal) of do. from fig. 5, same plate. 
Mippie Op Rep Sanpstone.—Lethen- Bar, Elgin, 
Fic. 6.—a, b. HoLoprycuius NoBILISsIMus, Agassiz. 
Sil. Syst., vol. ii., p. 599, pl. ii., bzs., figs. 1-4, 8 and (?) 9. 
a, 0. From Poiss. Foss. Gras Rouge, pl. XXiil. 
a. The entire fish, under-side (from a specimen measuring 2 feet 4 inches, 
by 1 foot), reduced to one-eighth of natural size. b. Scale of do. 
(cycloidal) showing the large undulating furrows covering the surface 
of its exposed portion. Clashbennie, near Perth. 
MippLE OLD Rep Sanpstony.—Perth ; - Caithness; Crickhowell. (Morris) 
Portishead, near Bristol (W. H. B. ). 
