Lower Carhoniferous Fishes of Eastern Fifeshire. 83 

 Notes on Species. 



Diplodus. — I have found small Diplodus-tQQth in shales on 

 the shore at Pittenweem, but which can hardly be safely 

 identified with any known form, or considered as new. 



Cladod'us unicuspidatus, n.sp. (Plate V. Figs. 1 and 2). 



Base flat below ; depth from back to front about two-thirds 

 the width from side to side ; contour more convex in front 

 than behind. A single slender-pointed cusp arises from the 

 middle of the front of the base, and is erect, straight when 

 seen from the front (Fig. 1), sigmoidally curved when viewed 

 laterally (Fig. 2), covered with delicate-raised ridges which 

 increase in number downwards by intercalation. N^o trace 

 of lateral cusps. Height of cusp of most perfect specimen 

 -^Q inch, width of base laterally about the same. 



Under the term Monocladodus, Professor Claypole^ has 

 separated from Cladodus, Agassiz, two species from the 

 Cleveland shale, on account of the apparent want of lateral 

 cusps. Allied to Cladodus, and also possessing only one 

 cusp, are Zamhdodus and Hyhocladodus of St John and 

 Worthen.2 The present teeth, however, agree so closely 

 with Cladodus in all respects, save the want of lateral cusps, 

 and the comparatively short lateral extent of the base, that 

 I prefer leaving them with that genus for the present. 



A cluster of these teeth was found by myself many years 

 ago in a septarian nodule on the shore near the Eock and 

 Spindle, east of St Andrews. Owing to the hardness of the 

 matrix, it was impossible to work out the superficial con- 

 figuration of the teeth, except in two instances, where they 

 happened to be covered by white carbonate of lime. 



Sp)henacanthus Fifensis, n.sp. (Plate V. Fig. 3). — Length 

 of the largest specimen, 5f inches ; greatest antero-posterior 

 diameter, f inch ; implanted portion reaching up to If inch 

 in front and 2f inches behind ; form straight and tapering ; 

 posterior area slightly concave, its margin showing traces 

 of abraded denticles; anterior margin of exserted portion 

 formed by a sharp median ridge; sides ornamented by 



^ American Geologist, vol. xi. (1893) p. 329. 

 ^ Geol. Survey of Illinois, vol. vi. 



