PLEUKACANTHID^:. 
11 
P. 3025. Thirteen teeth, one of unusual size, with very broad 
compressed principal cusps ; Longton. Enniskillen Coll. 
P. 5161. Large tooth ; Longton. Purchased, 1885. 
P. 5448. Tooth, associated with dermal prickles ; near Manchester. 
P. 1726. Imperfect teeth ; Leeds. Egerton Coll. 
41205 a. Small tooth ; Newcastle-upon-Tyne. 
Presented by T. P. Barkas, Esq., 1808. 
Diplodus tenuis, sp. nov. 
1843. Diplodus gibbosus, L. Agassiz, Poiss. Foss. voL iii. p. 204, pi. 226, 
figs. 2-5. 
1861. Pleuracanthus {Xenacanthus) gibbosus, J. W. .Salter, Iron Ores 
Gt. Britain — South Wales (Mem. Geol. Surv.), p. 224, pi. i. fig. 10. 
(?) 1873. Diplodus gibbosus and Diplodus sp., T. P. Barkas, Coal Meas. 
Palaeont. p. 16, pi. i. figs. 6-13. 
1874. Diplodus, W. J. Barkas, Monthly Rev. Dental Surgery, vol. ii. 
p. 346, figs. i.-v. 
Type. Detached teeth, PI. VI. figs. 2-4 ; British Museum. 
The two principal cones of the dental crown slender, round in 
section, slightly compressed and divergent towards the extremities ; 
intermediate denticle very long and slender. 
i^orm. Loc. Coal-Measures : Scotch Coalfield ; Northumberland, 
Yorkshire, Lancashire, Staffordshire ; South Wales. 
P. 3026. Remains of associated teeth. One, exhibiting the anterior 
aspect, is shown, of twice nat. size, in PI. VI. fig. 2 ; 
another, side view, in fig. 4 ; Carluke. Enniskillen Coll. 
20695-6. Four pieces of shale with numerous teeth ; one, exhibiting 
the posterior aspect, is shown, of twice nat. size, in PI. 
VI. fig. 3 ; Carluke, Lanarkshire. Purchased, 1847. 
21422. Portion of a similar tooth ; Carluke. Purchased, 1847. 
21975. Four teeth ; Carluke. Purchased, 
P. 5444. Associated teeth ; Dalkeith, Edinburgh. Enniskillen Coll. 
41635. Six pieces of shale with teeth and fragments of cartilage, and 
scattered minute pointed tubercles, suggestive of a sparse 
shagreen ; Newcastle-upon-Tyne. 
Presented by T. P. Barkas, Esq., 1869. 
P. 1182. Associated group of teeth, with fragments of cartilage ; 
Middle Coal-Measures, Tingley, Yorkshire. 
Presented by the Earl of Enniskillen, 1882. 
P. 1725a. Tooth; Deep-mine shale ; Longton. Egerton Coll. 
