468 On the Fossil Fishes of the Carboniferous Limestone Series of Great Britain. 
surface, enamelled and covered with irregularly disposed minute punctures. 
Anterior margin straight or slightly convex; with the lateral margins it forms 
obtuse-angled triangles; sides straight, widening to the junction with posterior 
surface. Posterior margin slightly convex in the middle, depressed prior to its 
forming the latero-posterior angles on each side. Latero-posterior angles acute, 
extending a short distance beyond the general posterior surface, but not so 
decidedly produced as in the previous specimens. Base hidden. 
The teeth vary a little in size, the largest representative bemg °6 of an inch in 
length. The crown in the larger specimens is much worn, and quite concave 
towards the anterior margin. 
This little tooth is more rectangular than either of the species described. In 
form it more nearly approaches to C. cornutus, but it differs essentially from the 
small or young specimens of that species; they possess the circular or convex 
anterior margin, slightly rounded sides and well-developed posterior concavity, with 
the horn-like prominences ; none of these characters, however, pertain to Copodus 
minimus. The specimens are from the Mountain Limestone of Richmond, and 
they are the only examples which have been found in that locality. 
Formation and locality; : Carboniferous Limestone, Richmond, Yorkshire. 
Ex. coll. Earl] of Enniskillen. 
Genus—Labodus, Agass. MSS. 
Labodus— L. Agassiz, 1859. MSS. Enniskillen Collection. 
Palatal teeth, medium size, more or less rhomboidal in outline, thick. 
Crown, plain or convex, with a raised lateral margin, surface uniformly 
punctate ; anterior margin straight or slightly sinuous; lateral margins convex ; 
posterior well rounded ; base much broader, but more contracted medially than 
the crown ; thick, osseous, and extending beyond the coronal surface, so as to form 
lateral extensions, culminating at the latero-posterior angles in diagonal projections, 
higher and more prominent than the enamelled surface of the crown. 
Labodus prototypus, Agass. MSS. 
(Pl. LVIIL., figs. 9-11.) 
Labodus prototypus—L. Agassiz, 1859. “MSS. Enniskillen Collection.” 
a om Morris & Roberts, 1862. “ Quart. Jour. Geol. Surv.,” Vol. XVIII., p. 101. 
5 i; Enniskillen, 1869. “Cat. Type Fossil Fishes.” 
9 2p J. J. Bigsby, 1878. ‘Thesaurus Devon. Carb.,” p. 357. 
Teeth, more or less rhomboidal in form ; breadth of enamelled portion of crown, 
‘9 of an inch, beyond which extend lateral processes, giving a total breadth of 1:2 
inches, The length of the crown along the median axis is ‘65 of an inch. Crown, 
convex from anterior to posterior surface ; anterior half much worn by attrition, 
and more or less concave in consequence. The central portion of the crown, °55 of 
