474 
ON THE GENUS CCELACANTHUS AS FOUND IN THE YORKSHIRIl COAL 
measures, with a restoration of the fish, 
by edgar d. wellburn, l.r.c.p.e., f.r.lp.h., f.g.s., etc. 
Introduction. 
The author having collected a very large number of specimens 
of these fishes from the Yorkshire Coal Measures, many being nearly 
perfect, whilst several of the species are new to science, he thought 
that it might be of interest to place on record the result of his finds, 
especially as they have enabled him to complete a restoration of 
the fish, showing nearly the whole of its anatomy ; and it is further 
worthy of note that one of his specimens shows the internal skeleton 
of the lobe of the pectoral fin,"^ and enables him to confirm Dr. A. 
Smith Woodward'st description of the anatomy of this fin, and this 
is of particular interest, as, besides the author's, there is only one 
other specimen from the Talbragar Beds (Jurrassic New South 
Wales, which throws any light on this interesting and important 
point. 
General Anatomy of the Fish. 
Form and Proportions. 
In form the fish is deeply and irregularly fusiform. Of the 
total length the head occupies one-fourth, the body two-fourths, 
and the tail the remaining fourth. The greatest depth of the body 
is at a point immediately posterior to the first dorsal fin, the depth 
here being about one-fourth the total length of the fish. 
Head. — External Anatomy. 
The head is peculiarly characteristic in form, one of the chief 
peculiarities being the slope of the cranial roof bones. The cranial 
*Wellburn, GeoL Mag., Dec. IX., VoL VIII., No. 440, p. 71. 
t Woodward, A. S., Mem. GeoL Survey of New South Wales, Palieontology 
No. 9, 1895. 
