EXPLANATION OF PLATE LXXIII. 



Figure 



1-4. Pleuracanthus cylindricus (Agassiz), Davis. 



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



2. ? Ex coll.—V. 1735, British (Natural History) Museum. 



3. Knowles Ironstone, Longton. Ex coll. — John Ward. 



4. Quarter Hamilton, Scotland. Ex coll. — James Thomson. 



5-13. Pleuracanthus alatus, Davis. 



5. Tingley, Yorkshire. Ex coll. — James W. Davis. 



6. Middleton, Yorkshire. Ex coll. — Museum, Leeds. 

 7-9. Deepmine Shale, Longton. E.v coll. — John Ward. 



10-12. Lowmain, Newsham. Ex coll. — Newcastle Museum. 



13. Quarter Hamilton, near Glasgow. Ex coll. — James Thomson. 



14-16. Pleuracanthitg (rectus, Davis. 



14. Lowmain, Newsham. Ex coll. — Newcastle Museum. 

 15, 16. Cannel Coal, Tingley. Ex coll. — James W. Davis. 



17. Pleuracanthus Thomsoni, Davis. Quarter Hamilton, Kilmarnock. Ex coll. — James Thomson. 



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



Davis. 



19, 20. Pleuracanthus serratus, Davis. Lowmain Coal, Newsham. Ex coll. — Newcastle Museum. 



21. Pleuracanthus Woochoardi, Dsivis. Candenfoot, Dalkeith. Ex coll. — P. 3178, British (Natural 

 History) Museum. 



22, 23. Pleuracanthus Taylori (Stock), Davis. 



22. Coal Measures, Airdrie. Ex coll. — No. 42,035, British (Natural History) 



Museum. 



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



24. Pleuracanthii.t trianciularis, Davis. Tingley, Yorkshire. Ex coll. — James W. Davis. 



25. Anodontacanthus acutus, Davis. Cannel Coal, Tingley, Yorkshire. Ex coll. — James W. Davis. 



26. Anodontacanthus obtusus, Davis. Cannel Coal, Tingley. Ex coll. — James W. Davis. 



27. Pleuracanthus (Diplodus) equilateralis, Ward. Deepmine Ironstone, Longton. Ex coll. — John 



Ward. 



[18] 



9107 009 



