PUA i XOX EL. 
(The cost of this plate has been defrayed by the Carnegie ‘Trust for the Universities 
of Scotland.) 
Fia. 
1. Cycloptychius carbonarius, Young; natural size. ‘The front part of the head is lost. 
From the Deep-mine Ironstone Shale, Longton, Staffordshire. In the Royal 
Scottish Museum, Edinburgh. 
2. Another specimen showing the head well, but the caudal fin badly. In the Ward 
Collection, British Museum (Natural History), no. P. 7966; from the same stratum 
and locality. 
3. Another specimen from the same stratum and locality, also in the Ward Collection, 
British Museum (Natural History), no. P.7967. ‘The head and anterior part of 
the body are wanting, but the caudal fin is exceedingly well shown. 
4. Exposed surfaces of three flank-scales of the same species, magnified, showing 
sculpture. 
Or 
. Entire outline of another flank-scale magnified. 
6. Cycloptychius concentricus, Traquair; natural size. From the Lower Carboniferous 
(Calciferous Sandstone Series) of Glencartholm, Eskdale, Dumfriesshire. In the 
Collection of the Author. 
7. Sculptured surfaces of two flank-scales of the same species, magnified six diameters. 
8. Sculptured surfaces of three scales above the lateral line, magnified six diaineters. 
9. Sculptured surfaces of two scales, situated near the caudal extremity, magnified six 
diameters. 
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