COCRLIODONTIDiK. 
173 
The following specimens may indicate a hitherto unknown 
species:— 
P. 5157-8. Tooth measuring 0-019 in the longer diameter, asso¬ 
ciated with small teeth; also two associated teeth and 
fragments pertaining to an equally large fish; Fenton. 
Purchased , 1885. 
Dus SWtCL 
Genus PLEUROPKHC, nomen nov. 
Syn. Pleurodus, Hancock & Attliey (non Pleurodon , Wood, 1810, nec 
Harlan, 1842), Nat. Hist. Trans. Nortkumb. & Durham, vol. iv 
1872, p. 408. 
Rami of jaws meeting at an acute angle; teeth, so far as known, 
mostly fused into continuous transverse plates, few in number, 
carinated, and having indented antero- and postero-lateral borders, 
marking the free extremities of the components. Body depressed, 
covered with fine shagreen ; dorsal fin-spine laterally compressed, 
broad, smooth, or ornamented with delicate longitudinal striae. 
Pleuropetex rankinei 3 Haneock & Atthey. 
1843. Pleurodus rankinei, L. Agassiz, Poiss.Foss. vol. iii. p. 174 (name 
oniy). 
1843. Pleurodus affinis, L. Agassiz, loc. cit. (name only). 
1801. Pleurodus affinis , J. W. Salter (ex Egerton, MS.), Foss. S. Welsh 
Coal Field (Mem. Geol. Surv.—Iron Ores Gt. Brit. pt. iii.), p. 225 
pi. i. figs. 18, 19 (figures only). 
1801. Pcecilodus (?.) sp., J. W. Salter (ex Egerton, MS.), loc. cit. 
p. 225, pi. i. fig. 20 (abraded tooth, figure only). 
1872. Pleurodus rankinii , A. Hancock & T. Atthey, Nat. Hist. Trans. 
Nortkumb. & Durham, vol. iv. p. 408, pi. xv. fig. 1. 
1873. Pleurodus , T. P. Barkas, Coal Meas. Balmont, p. 18, pi. i. 
figs. 24-27. 
1874. Pleurodus affinis , W. J. Barkas, Monthly Rev. Dental Surgery, 
vol. iii. p. 0, figs, xxxvi.-xxxix. 
1875. Pleurodus affinis , J. Ward, [Proc.] N. Staffs. Nat. Field-Club, 
p. 223. 
1875. Pleurodus rankinii, J. Ward, loc. cit. p. 222, fig. 13. 
1879. Pleurodus affinis , J. W. Davis, Quart. Jourrn Geol. Soc. vol. 
xxxv. p. 181, pi. x. figs. 1-11. 
Type. Associated dental plates, and anterior portion of body with 
dorsal fin-spine; Museum of Newcastle-upon-Tyne. 
Axial rounded carina of the dental crown prominent, rarely 
marked by faint transverse sulci; unabraded coronal surface smooth, 
or with delicate irregular wrinkles near the margin. Anterior 
