458 On the Fossil Fishes of the Carboniferous Limestone Series of Great Britain. 
The curiously irregular humplike figure and subquadrate form of the base of 
this species distinguish it from its congeners; the steep striated side is also 
peculiar. 
Formation and locality : Mountain Limestone, Armagh. 
Ex. coll. Admiral Jones, Geological Society, London. 
Genus Pleurodus, Agass., indet. 
Teeth, small, triangularly or obliquely ovate; anterior extremity more or less 
pointed expanding backwards, nodose median ridge extends along longer axis of 
the crown, laterally thin ; margins more or less expanded and deeply indented 
Surface covered with enamel; punctate, occasionally reticulate. Base thin, 
coextensive with crown, hollow beneath. 
‘The species hitherto described from British strata have been found only in the 
Coal Measures. The horizon of the genus is extended by the discovery of the 
species here described, downwards to the Mountain Limestone. 
Pleurodus woodi, Davis. 
(Pl. LIX., figs. 12-15). 
Teeth, small; length °3 of an inch; greatest width equal to the length ; more or 
less triangularly-ovate in outline. Crown, convex ; laterally expanded ; median line 
prominently developed to form a ridge extending across the greatest diameter. 
Median ridge divided into five or fewer projecting nodes, from which lateral ridges 
descend to the external margins ; these are terminally separated by deep indentations 
of the margins; one end of the tooth, probably the posterior one, is wider and 
somewhat rounded, the sides gradually taper to the opposite end. Surface of the 
projections of the median ridge are frequently worn by attrition: uniformly and 
somewhat coarsely punctate. Base or root thin, porous, conforms generally to the 
outline of the crown; proportionately concave to the convexity of the crown. 
The teeth vary in outline, the anterior margins in some are deeply indented, 
in others scarcely at all. A few specimens are very long in proportion to the 
width. 
In recognition of the services of the late Mr. Wood, of Richmond in Yorkshire, to 
paleontological science, I have pleasure in appending his name to distinguish these 
teeth specifically. 
Formation and locality : Mountain Limestone, Richmond in Yorkshire. 
Ex. coll. Reed Collection, York Museum ; Mr. Horne, Wensleydale. 
