524 On the Fossil Fishes of the Carboniferous Iimestone Series of Great Britain. 
Prof. M‘Coy remarks of this species, that it is an almost perfectly straight, 
cylindrical tooth, the apex being unfortunately wanting, but enough remains to 
show that towards the extremity the anterior face becomes flattened so as to give 
an obscurely trigonal section : there are two alternating rows on each side of about 
thirteen or fourteen short transverse furrows, forming between them obscure 
wrinkles : the whole surface to the naked eye seems smooth and highly polished, but 
under a low power, the fine, impressed, rather distant longitudinal sulci become 
visible. The whole tooth seems directed backwards at a considerable angle from 
its round bony base, and the inferior termination of the enamel-lke portion is 
therefore very oblique to the axis of the tooth, being considerably lower. in front 
than behind, the edge seeming of considerable thickness from a sharp constriction 
being immediately under it all round, beneath which again the osseous base 
thickens to form a little peltate mass. The length of the portion preserved is °9 
of an inch, width at base °3 of an inch, diminishing towards the apex to °15 of an 
inch, 
This peculiar form, at present in the Museum of the Geological Society of London, 
which served as the basis of the above description in 1848, still remains unique. 
It differs very much from any other teeth discovered in the Mountain Limestone. 
Its relationship is considered by Prof. M‘Coy, to be with Rhizodus or Dendrodus, 
and consequently that it is the tooth of a ganoid fish, but the likeness is somewhat 
remote, and awaiting further discoveries, it may be as well to withhold any opinion 
as to its zoological affinities or position. 
Formation and locality: Mountain Limestone, Armagh. 
Ex coll. Jones Collection, Museum of the Geological Society, London. 
Genus.—Ceelacanthus, Agass. 
(Pl. LXIIL., figs. 7-12.) 
Several detached plates of a species Ccelacanthus have been found in the 
limestone at Armagh. They consist of an operculum, jugular plates, mandible, and 
other bones of the head as well as some scales. ‘They possess the characteristic 
surface ornamention of the genus and probably belong to the species C. lepturus, 
Agassiz. 
Formation and locality : Mountain Limestone, Armagh. 
Ex coll. Karl of Enniskillen. 
