■ EXPLANATION OF PLATE LXXII. 



Figure 



1. Pleuracanthus Icemadmus, Agass. 



3-9. Pleuracanthus IcBvissimus, Agass. 



1. Eagmine Ironstone, Fenton. Ex coll. — John Ward. 



3. Cannel Coal, Tingley. Ex coll. — James W. Davis. 

 4, 5. Arley Mine, Burnley. Ex coll. — George Wild. 

 6, 7. Lowmain Coal, Newsham. Ex coll. — Newcastle Museum. 



8. Shattleston, Glasgow. Ex coll. — James Thomson. 



2. Pleuracanthus cylindricus, Agass. Fenton, Staffordshire. Ex coll. — P. 6692, British (Natura 



History) Museum. 



10-14. Pleuracanthus robustus, Davis. 



10, 11, 14. Cannel Coal, Tingley. Ex coll. — James W. Davis. 



12. Knowles Ironstone Shale, Fenton. Ex coll. — John Ward. 



13. Lowmain Coal, Newsham. Ex coll. — Newcastle Museum. 



15. Pleuracanthus Wardi, Davis. Eagmine Ironstone, Fenton. Ex coll.— John Ward. 



16. Pleuracanthus undulatus, Davis. Thin-hed Coal, Burnley. Ex coll. — G. Wild, Manchester 



Museum. 



17. Pleuracanthus tenuis, Davis. Better-bed Coal, Yorkshire. Ex coll. — James W. Davis. 



18-20. Pleuracanthus denticulatus, Davis. 



18. Better-bed Coal, Yorkshire. Ex coll. — James W. Davis. 



19. Lowmain Coal, Newsham. Ex coll. — Newcastle Museum. 



20. Bardsley, Lancashire. Ex coll. — George Wild. 



21. Pleuracanthus Howsei, Bajvis. Lowmain Coal, Newsham. Ex coll. — Newcastle Museum. 



22, 23. Pleuracanthus hotridulus, Traq. Better-bed Coal, Clifton, Yorkshire. Ex coZL— James W. 

 Davis. 



N.B. — Fig. 2 in this Plate has been drawn'by mistake instead of the specimen of T. leevissimus, referred to in the text. 



[16] 



