/. — Pleuracanthidce. 747 



found identical with Orthacanthus,* and Mr. A. Smith Woodward accepts the 

 same view in cataloguing the fossil-fishes in the British Museum, and places the 

 genus as a synonym of Pleur acanthus. '\ 



Formation and Locality. — Middle Coal Measures, Tingley, in Yorkshire. 

 Ex coll. — James W. Davis, Halifax. 



Pleuracantlius (Diplodus) equilateralis, Ward. 

 (PI. Lxxm., fig. 27.) 



Diplodus equilateralis, . . Ward, J., 1889, " Trans. N. Staffs. Inst. Mining 



and Mech. Engin.," vol. s., p. 139, pi. ii., 

 fig. 2. 



Diplodus equilateralis, . . Woodward & Sheeborn, 1890, " Cat. Brit. Foss. 



Verteb.," p. 66. 



Teeth: "Base of tooth relatively small, rounded, or oval; concave below, 

 coarsely pitted with a strong prominent knob or heel-like projection at the 

 anterior margin. Lateral denticles, two in number, divergent on the same plane ; 

 they are short, conical, broad for nearly their entire length, when they rapidly 

 contract ; compressed, equal in length, with their margins finely carinated. 

 Between the two lateral denticles, at their basal junction, there is a slightly 

 elevated boss, from which spring two intermediate denticles, equal in length, 

 compressed, with smooth margins " (Ward). 



Formation and Locality. — Shale overlying the Deepmine Ironstone, Longton. 

 Staffordshire. 



Ex coll. — John Ward, Longton. 



Grenus, Anodoutacantlius, Davis. 

 " Quart. Journ. Greol. Soc," 1881, vol. xxxvii., p. 427. 



The spines included in this genus are straight, more or less tapering to a point. 

 Internal cavity large, terminating at the base without posterior extension of the 

 opening. Distinguished from Pleuracantlius by the absence of denticles. 



''' Handb. der Palaeontologie, vol. iii., pt. i., p. 90. 1887. 

 f Cat. Foss. Fishes, pt. i., p. 2. 



