PLATE XXX. 
(‘The cost of this Plate has been defrayed by the Carnegie ‘Trust for the Universities 
Fa. 
le 
ae 
of Scotland.) 
Rhadinichthys Canobiensis, Traquair; natural size. From the Lower Carboniferous 
(Calciferous Sandstone Series) of Glencartholm, Eskdale, Dumfresshire. In the 
Royal Scottish Museum, Edinburgh. 
Flank-scale of the same species ; magnified six diameters. 
The same, a less ornate variety ; magnified six diameters. 
Scales situated further back, towards the tail; magnified six diameters. 
Narrow abdominal scales ; magnified six diameters. 
Scale from the nape of the neck ; magnified six diameters. 
Rhadinichthys elegantulus, 'Vraquair; natural size. From Glencartholm. In the 
Collection of the Geological Survey of Scotland. ‘This is the original of RA. 
Geikiei, var. elegantulus, Traquair. 
Head of the same specimen enlarged two and a half times. p., parietal; 7, frontal ; 
e., Superethmoidal ; o7., orbit ; op., operculum ; s. op., suboperculum ; ma., maxilla ; 
d., dentary of mandible ; p.é., post-temporal; s. c/., supra-clavicular ; c/., clavicle. 
Scales from the nape of the neck of the same specimen ; magnified six diameters. 
Flank-scales ; magnified six diameters. 
Scale towards the tail; magnified six diameters. 
Rhadinichthys Canobiensis, var. delicatulus, Vraquair ; natural size. From the same 
horizon and locality as the above. Also in the Collection of the Geological 
Survey of Scotland. 
Sketch of the head of the same specimen enlarged two and a half times. Lettering 
as in Fig. 8. 
Flank-scales of the same ; magnified six diameters. 
Scales further back; magnified six diameters. 
