PLErBACANIHlI)^. 
P. 3177. i>inall, much-abraded spiue ; Bassy-mine Ironstone, Long- 
ton, Jf. Staffordshire. Enniskillen CoU. 
P. 244, P. 5447. Fragments of large spines ; New Ironstone, Fen- 
ton, N. Staffordshire. Purchased, 1880, 1886. 
The following species have also been founded upon detached 
spines, but there are no examples in the Collection ; — 
Pleuracanthus dUitus, J. W. Davis, Quart. Journ. Geol. Soc. 
vol. xxxvi. (1880), p. 329, pi. xii. fig. 4. — Middle Coal- 
Measures ; Tingley, Yorkshire. 
Pleuracanthus alternidentatus, J. W. Davis, tom. cit. p. 328, pi. xii. 
fig. 3. — Coal-Measures ; near Leeds, Yorkshire. 
Pleuracanthus htserialis, J. S. Newbeny, Proc. Acad. Nat. Sci. 
PhUad. 1856, p. 100. — Coal-Measures; Ohio. 
Pleuracanthus bohemieus : (h-thacanthus hohemicus, A. Fritsch, 
Sitzungsb. konigl. bohm. Gesell. Wiss. 1877, p. 47 ; 
loc. cit. 1879, p. 189 ; K. A. Zittel, Handb. Palaeont. 
vol. iii. pt. i. (1887), p. 90, woodc. fig. 101. — Lower 
Permian ; Bohemia. 
Pleuracanthus denticulatus, J. W. Davis, tom. cit. p. 334, pi. xii. 
fig. 7. — Lower Coal-Measures ; near Halifax, Yorkshire. 
Pleuracanthus dilatatus, J. S. Newberrj’, Proc. Acad. Nat. Sci. 
PhUad. 1856, p. 100. — Coal-Measures ; Ohio. 
Pleuracantlms elegans, E. H. Traquair, Gcol. Mag. [2] vol. viii. 
(1881), p. 36. — L. Carboniferous; Borough Lee, Edinburgh. 
Pleuracanthus frossardi, A. Gandry, Nouv. Archiv. Mus. vol. iii. 
(1867), 39, pi. iii. fig. 6.— Middle Permian ; Autun, 
Saone-et-Loire, France. 
Pleuracanthus gaudryi, C. Brongniart, Comptes Bend., vol. cvi. 
(1888),p. 1240. — Coal-Measures; Coronientiy, AlUer. 
Pleuracanthus graciTlimus, E. H. Traquair, Geol. Mag. [2] vol. ix. 
(1881), p. 540. — Lower Carboniferous; Borough Lee, near 
Edinburgh. 
Pleuracanthus horridulus, E. H. Traquair, tom. cit. p. 541 . — Lower 
Carboniferous ; Borough Lee, near Edinburgh. 
Pleuracanthus lavis: Ccmpsacanthus lavis, J. S. Newberry, Proc. 
Acad. Philad. 1856, p. 100, and Eep. Geol. Surv. Ohio, 
voL i. pt. ii. (1873), p. 332, pi. xl. fig. 5 ; (?) Orthacanfhus 
gracilis, id. ojj. cit. vol. ii. pt. ii. p. 56, pi. lix. fig. 7. — 
Coal-Measures; Ohio. 
Pleuracanthus guadriseriatu.s : Orihacanthus quadriseriatus, E. D. 
Cope, Proc. Amer. Phil. Soc. 1877, p. 192. — Permian; 
Eastern Illinois. 
