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Lepracanthus Colei. Egerton. 
Was described and named by Professor Owen in tho 
"Gfeological Magazine" for 1869, p. 481, from a single speci- 
men found by the Earl of Enniskillen in the coal shale at 
Ruabon. 
The species occurs in the Bone-bed, about a score speci- 
mens having been found. The largest measures 3J inches 
in length and of an inch wide, being an inch longer 
than the one described by Professor Owen. He says : — 
The spine is gently curved, moderately compressed, with 
the back or convex border rounded ; the thinner concave 
border is armed by relatively large, recurved, pointed 
denticles, sub-compressed and strengthened by an almost 
ridge-like swelling along the middle of each side. These 
denticles are few in number compared with most similarly- 
barbed fossil fish-spines ; four project from about one-third 
of the length of the body of the spine, and not more than 
seven are traceable in the present specimen." 
In one or two of the specimens from the Bone-bed, which 
have left the matrix without being fractured, the spine m 
seen to have been hollow, with a row of denticles on each 
side of the concave border ; these are placed alternately, and 
not opposite to each other, so that there are 13 or 14 denticles, 
in place of 7 as seen by Professor Owen, one half of the 
type specimen being hid in the matrix. 
AcANTHODES Wardi. Egerton. 
Spines of this species are common. They vary extremely 
in size, from one inch and a half long, and one-eighth of an inch 
broad, to seven or eight inches in length, and fully half an 
inch in breadth. All are characterised by the deep fiirroAV 
running parallel to the convex portion of the spine. 
Pleuracanthus lcevissimus. Agass. 
Yery rare. One specimen nearly 8 inches in length and 
