On-the Fossil Fishes of the Carboniferous Limestone Series of Great Britain. 467 
Copodus spatulatus, Agass. MSS. 
GAL, ILWIDUL, ste 7). 
Copodus spatulatus—L. Agassiz, 1859. MSS. Enniskillen Collection, 
. s Morris and Roberts, 1862. “Quart. Jour. Geol. Soc.,” Vol. XVIIL., p. 100. 
- Pe Enniskillen, 1869. “Cat. Types Fossil Fishes,” p. 4. 
x . J. J. Bigsby, 1878. ‘Thes. Devonico-Carb.,” p. 351. 
Teeth, square, with rounded anterior angles ; at each postero-lateral angle there 
is a wing-like projection from the body of the tooth, and at a distance of one-sixth 
the diameter of the tooth isa suture parallel with the posterior margin. Length 
of the tooth, -9 of an inch; breadth across centre of the crown, ‘8 of an inch, 
diminishes anteriorly to -6 of an inch, and increases backwards to 1 inch. Trans- 
-verse section exhibits a convex base and slightly convex crown; greatest diameter, 
-3 of an inch, thinning towards each side to a little more than ‘1 of aninch. The 
thickness diminishes slightly towards the anterior extremity, and more so towards 
the posterior. Crown, convex in central portion, with a raised broadly circular 
rim, forming the lateral borders; anterior portion deeply excavated by attrition 
during mastication ; posterior part of the tooth depressed and separated by a 
distinct suture-like groove from the larger coronal area. ‘The latter is covered with 
the usual minute pittings; the narrow posterior portion is less distinctly marked 
and presents a reticulated surface. Anterior margin of crown straight in the 
median portion, projecting beyond the extremity of the base ; antero-lateral angles 
rounded, sides slightly convex, and expanded towards the back of the tooth into a 
projection from the enamelled surface of the crown. The posterior margin for the 
major part straight, each latero-posterior angle slightly produced and pointed 
backwards. The latero-posterior expansions in this species are from the sides, whilst 
in C. cornutus and C, furcatus they were developed from the body of the crown 
backwards. In ©. spatulatus the enamel of the coronal surface does not extend, 
as in the species already described, so as to envelop the lateral expansion, but its 
surface is rough, pertaining more to the bony character of the base. The 
principal distinguishing feature, however, consists in the suturelike depression 
running parallel to the posterior margin ; in no other species does this occur. 
Formation and locality : Carboniferous Limestone, Armagh. 
Hz coll, Earl of Enniskillen. 
Copodus minimus, Davis. 
(PL, IENVIDUE, ate, 3) 
Teeth, small, equilateral, angular, in general form differmg from all the other 
species. Length along the median axis, 4 of an inch ; breadth across posterior 
extremity, ‘35, diminishing gradually to the anterior, where the breadth is 2 of 
an inch. Crown slightly convex from front to back, straight from side to side ; 
