604 BRITISH PALAZOZOIC FOSSILS. [ Pisces. 
This beautiful species is easily distinguished from all others by the shortness of the anterior end of its 
yentral mesial plate, which is the only part yet known. The tubercles resemble those of a small Oidaris or 
Asterolepis. 
Explanation of Figures.—P\. 2. C. fig. 6, probably mesial ventral plate, natural size ; fig. 6 a, tuberculation 
of do. magnified. 
