On the Fossil Fishes of the Carboniferous Limestone Series of Great Britain. 477 
Pinacodus gonoplax, Agass. MSS. 
(IP, IGN INO, iez, 24,)) 
Pinacodus gonoplax—L. Agassiz, 1859. MSS. Enniskillen Coll. 
" 5 Morris & Roberts, 1862. “ Quart. Journ. Geol. Soe.,” Vol. XVIITI., p. 101, 
P Pe Enniskillen, 1869. ‘ Catal. Type Spec.,” p. 7. 
3 o J. J. Bigsby, 1878. ‘Thesaurus Devonico-Carb.,” p. 363. 
r 
Teeth, sub-quadrate, slightly conical in outline, °6 of an inch broad, and °5 of 
an inch in length, -16 of an inch thick. Crown, convex or concave in central part ; 
convex teeth depressed on each side the convexity, the borders raised in all cases to 
form prominent ridges. Coronal surface punctate or rugose. The anterior margin 
in the majority of specimens is deeply concave, with antero-lateral angles, rounded 
to a line with the lateral margin; lateral margin straight or slightly convex ; 
posterior margin convex, upper part forming the angle with the coronal surface 
constitutes a serrated ridge along the edge of the crown; postero-lateral angles 
obtuse and rounded. Base not well exposed, but appears to be same form as 
crown. 
In one of the specimens there is a second smaller tooth attached to the 
anterior margin described above, transversely elongated ; it is the same width as the 
larger tooth, whilst its length is °15 of an inch only. Its surface is convex, with 
raised lateral border, conforming generally to that of the adjoining one. The 
anterior margin of the second tooth is convex ; posterior one convex, fitting closely 
to the concavity of the larger tooth. 
The arrangement of the two teeth forming this species affords confirmatory 
evidence of the identity of the Copodus lunulatus with Copodus cornutus of Agassiz, 
as previously stated in these pages. In this instance, as in Rhymodus transversus, 
Ag., the second palate is situated at the front of the larger one, whilst in Copodus 
cornutus the concavity is at the posterior margin of the tooth, and the second 
palate was situated behind the larger one. 
Formation and locality : Carboniferous Limestone, Armagh ; rare. 
Hex coll. Earl of Enniskillen. 
Pinacodus gelasimus, Agass. 
(Pl. LVIIL., fig. 23.) 
Pinacodus gelasimus—L. Agassiz, 1859. MSS. Enniskillen Coll. 
0 3 Morris and Roberts, 1862. ‘Quart. Journ. Geol. Soc.,” Vol. XVIIL, p. 101. 
» 9» Enniskillen, 1869. ‘‘ Catal. Type Spec.,” p. 7. 
op e J.J. Bigsby, 1878. ‘Thesaurus Dey.-Carb.,” p. 363. 
Teeth, breadth double the length, posteriorly the breadth is °6 of an inch, 
diminishing gradually to the anterior extremity where the breadth is “4 of an inch, 
length ‘3 of an inch. Crown flat, with a slight convexity at the edges, a circular 
