384 On the Fossil Fishes of the Carboniferous Limestone Series of Great Britain. 
crown slightly converges and is divided into two branch-like roots with a median 
depression intervening. Laterally the crown is divided on each side into about a 
dozen deeply-cut crenulations: the latter strongly implanted, round, club-shaped, 
and curved towards the apex of the tooth : they are largest in the central portion 
of the tooth becoming smaller upwards, the point being without crenulations. 
The coronal surface is smooth and enamelled. The base short, convergent, divided 
into two branches which are less in diameter than the crown of the tooth. 
Formation and locality : Mountain Limestone, Armagh. 
Ex coll. Ear] of Enniskillen. 
Genus.—Pristicladodus, M‘Coy. 
Pristicladodus—-M ‘Coy, F., 1854. “ British Paleozoic Fossils,” p. 642. 
“Base of tooth expanded at right angles to the crown, large, sub-semicircular, 
thick, coarsely osseous ; from the truncated straight edge of the base in front the 
crown rises as one large, thick, sharply-pointed, compressed cone, with two denti- 
culated cutting edges, lateral cones very few (? one on each side or none), surface of 
crownhighly polished and marked with finelongitudinal ridges, orsmooth.”"—(M‘Coy). 
Pristicladodus dentatus, M’Coy. 
(Pl. XLIX., fig. 22.) 
Pristicladodus dentatus—M ‘Coy, F., 1854. “ Brit. Palteoz. Foss.,” p. 642, pl. 3 G., fig. 2. 
% 5 Morris and Roberts, 1862. “Quart. Journ. Geol. Soc.,” Vol. XVIII. p. 101. 
:. 5 J.J. Bigsby, 1878. “'Thes. Dey.-Carb.,” p. 363. 
Teeth, “medial cone large, triangular, rather flattened on the outer side, and 
with a deep triangular hollow, the base of which is parallel with, and a little above 
the base of the tooth, which is narrow, arched upwards in the middle, and not prom- 
inent ; the sides of the hollow are parallel with the sides of the tooth ; back of the 
crown rounded, sharply convex ; cutting edges set with a row of strong, equal, sharply- 
defined, sub-cylindrical, obtusely pointed teeth, set at right angles to the edge (about 
three in the space of one line), about half their diameter apart, and rather longer 
than wide ; base on inner side horizontally extended, thick, fibrous, almost semi- 
circularly rounded; surface of large cone smooth on the outside, faintly striated 
longitudinally on the inner side.”—(M‘Coy). The specimen described by Prof. 
M‘Coy was an imperfect one. The one now figured shows that the lateral extensions 
of the base from the central cone, were devoid of secondary denticles. It is 1:4 
inches across the base, height of cone ‘9 of an inch. 
The specimen selected for illustration is from the collection of Wm. Horne, Esq., 
others occur in the Reed collection at the York Museum, and in Lord Enniskillen’s 
