PLATE XXVIII. 
(‘he cost of this plate has been defrayed by the Carnegie ‘Trust for the Universities 
Fig. 
le 
De 
3. 
A, 
D. 
6. 
ie 
8. 
of Scotland.) 
Rhadinichthys ornatissimus (Agassiz) ; natural size. A remarkably perfect specimen 
from the Dunnet Shale (Calciferous Sandstone Series) of Straiton, Midlothian. 
In the Royal Scottish Museum, Edinburgh. 
A large specimen of the same species from the Burdiehouse Limestone, Burdiehouse, 
showing the pectoral fin exceedingly well; natural size. Hugh Miller Collection, 
in the Royal Scottish Museum, Edinburgh. 
Head of another specimen from the Calciferous Sandstone of Wardie, near 
Edinburgh, obliquely compressed ; natural size. op., operculum; s. op., lower 
margin of suboperculuin ; ma., part of maxilla; mz., mandible; é7., branchio- 
stegal plates; br.', anterior broad plate of right and left branchiostegal series ; 
ér.", median plate; c/., portion of lower extremity of clavicle; ¢.c/., infra- 
clavicular plate. 
Dentary element of mandible of the same species, showing the external sculpture, 
but not the teeth, which are concealed in the stone; magnified by one half. 
From the Dunnet Shale, Straiton. In the Royal Scottish Museum. 
Flank-scale of the same species; magnified six diameters. rom Straiton. 
Scale further back ; magnified six diameters. From Straiton. 
Another posterior scale, magnified six diameters. From Straiton. 
Proximal portions of three fin-rays of the same species at the anterior commencement 
of the dorsal fin, showing the form of the joints and the commencement of the 
fulera; magnified six diameters. 
