NO. M97. BRACHIOPOD GENUS PLATYSTROPHIA—McEWAN. 445 



Plate 47. 



All figures on this plate are natural size. 

 Figs. 1-11. PlatystropMa crassa (James), p. 430. 



1. Brachial valve. 



2. Pedicle valve. 



3. Lateral view. The gibbous form is typical. 



4. Posterior view. 



5. Pedicle valve of a short thick mutation. 

 0. Anterior view of a short thick mutation. 



7. Anterior view of a specimen -vnth a high fold !)earing dwarfed lateral plications. 



S. Pedicle valve of a high fold specimen. 



9. Brachial valve. A specimen vvdth a high fold bearing weak lateral plications. 



10. Cardinal view of a short-hinged mutation. 



11. Anterior view showing the deep sinus. 



Mays\dlle (Ui3per Fairmount), Cincinnati, Ohio; Covington, Kentucky. 

 Fig. 12. PlatystropMa crassa, variety p. 432. 



12. Brachial valve. 



Richmond (Arnheim), 1^ miles south of Clark, Kentucky. 

 Figs. 13-15. Platystropkki paucipHcata Cumings, p. 417. 



13. Pedicle valve. The lateral slopes bear six plications. 



14. Anterior view. Showing the thin valves. 



15. Brachial valve. The fold is slightly elevated. 

 Maysville (Basal Fairmount), Covington, Kentuckj'-. 



Figs. 16-18. PlatystropMa profundosulcata (Meek), p. 429. 



16. Brachial valve of a narrow specimen. 



17. Pedicle valve showing the characteristic transverse form. 



18. Anterior view. The profound siniis is typical. 

 Maysville (Basal Fairmount), Cincinnati, Ohio. 



Figs. 19-21. PlatystropMa profundosulcata hopensis Foerste p. 430. 



19. Pedicle valve showing the decidedly transverse form. 



20. Brachial A'alve sho^ving the prominent fold. 



21. Anterior view. 



Maysville (Mount Hope), Cincinnati, Ohio. 

 Figs. 22-25. PlatystropMa cypha James, p. 435. 



22. Brachial valve showing the characteristic broad form. 



23. Anterior view. The profound sinus is typical. 



24. Pedicle A'ah-e which shows the extended hinge-line. 

 Richmoiid group (Arnlieim formation), Waynesville, Ohio. 



25. Anterior view showing the height of the fold. Richmond group (Arnheiai 



formation), 1 mile east of Seatonville, Kentucky. 

 Figs. 26-27. PlatystropMa cypha conradi Foerste, p. 436. 



26. Brachial valve. 



27. Pedicle valve. The lateral plications of the fold are strong. 



Richmond group (Arnheim formation), one-fourth mile northeast of Seaton- 

 \-ille, Kentucky. 

 Figs. 28-30. PlatystropMa cypha hellaiula, new variety, p. 438. 



28. Brachial valve. 



29. Anterior view. 



30. Pedicle valve showing the characteristic narrow form. 

 Richmond group (Wa\'ne8\'ille formation), Wa^/uesville, Ohio. 



