ORDOVICIAN AND SILURIAN BRACHIOPODA OF THE GIRVAN DISTRICT. 985 



Fig. 2. Rafinesquina (Playfairia) deltoidea (Conr.), var. nov. tenuicorrugata. Impression of exterior 

 of brachial valve. x 1|. Balclatchie Group, Balclatchie. G. 



Fig. 3. Ditto. Internal cast of pedicle-valve. x 1|. Same horizon and locality. G. 



Fig. 4. Rafinesquina (Playfairia 1) felix, sp. nov. Pedicle-valve. x 2. Starfish Bed, Drummuck 

 Group, Thraive Glen. G. 



Fig. 5. Ditto, ditto. x 1\. Same horizon and locality. G. 



Fig. 6. Ditto, ditto. x 1\. Same horizon and locality. G. 



Fig. 7. Ditto, ditto (shell partly abraded). x 1\. Same horizon and locality. G. 



Fig. 8. Ditto. Internal cast of brachial valve. x 2£. Same horizon and locality. G. 



Fig. 9. Ditto. Internal cast of pedicle-valve. x 2. Same horizon and locality. G. 



Fig. 10. Ditto, ditto, x 2|. Same horizon and locality. G. 



Fig. 11. Rafinesquina (Playfairia) Rickardsoni, sp. nov. Pedicle- valve. x2|. Whitehouse Group, 

 Shalloch Mill. G. 



Fig. 11a. Ditto. Median longitudinal section of same. x 2£. 



Fig. 12. Ditto. Pedicle-valve. x 2|. Same horizon and locality. G. 



Fig. 13. Rafinesquina (Playfairia) semiglobosina (Dav.). Pedicle-valve. Nat. size. Balclatchie Group 

 (conglom.), Balclatchie. G. 



Fig. 13a. Ditto. Outline side-view of same specimen. Nat. size. 



Fig. 14. Ditto. Cardinal areas of complete shell. x ]1 Stinchar Limestone Group, Craighead. G. 



Fig. 15. Ditto. Internal cast of pedicle- valve. x 2. Balclatchie Group, Balclatchie. G. 



Fig. 16. Ditto. Interior of brachial valve. x 1^. Stinchar Limestone Group, Craighead. G. 

 (Figured, Davidson, Suppl., pi. xv, fig. 11.) 



Fig. 17. Ditto, ditto. x \\. Same horizon and locality. G. 



Fig. 18. Ditto. Median longitudinal section of complete shell. Nat. size. Same horizon and 

 ' locality. G. 



Fig. 19. Ditto. Portion of surface of pedicle-valve. x 2£. Same horizon and locality. G. 



Fig. 20. Ditto. Interior of portion of shell. x 8. Same horizon and locality. G. 



Fig. 21. Rafinesquina. 1 brumalis, sp. nov. Pedicle- valve, x 3. Balclatchie Group, Balclatchie. G. 



Fig. 22. Ditto, ditto. x 3. Same horizon and locality. G. 



Fig. 23. Ditto, ditto, x 3. Same horizon and locality. G. 



Fig. 24. Ditto. Brachial valve, x 3. Same horizon and locality. G. 



Fig. 25. Rafinesquinal subarachnoidea, sp. nov. Pedicle-valve. x 2 \. Balclatchie Group, 

 Balclatchie. G. (Figured, Davidson, Suppl., pi. xv, fig. 23, as Strophomena corrugatella.) 



Fig. 26. Ditto, ditto. x 2£. Same horizon and locality. G. 



Fig. 27. Ditto. Complete shell, brachial view, x 3. Same horizon and locality. G. 



Fig. 28. Ditto. Cardinal areas of complete shell. x 3. Balclatchie Group (conglom.), Balclatchie. 

 G. (Figured, Davidson, Suppl., pi. xv, fig. 26, as Sir. corrugatella.) 



Fig. 29. Ditto. Right half of pedicle-valve. x 4. Balclatchie Group, Balclatchie. G. 



Fig. 30. Ditto. Pedicle-valve. x 3. Same horizon and locality. G. 



Fig. 31. Ditto. Brachial valve, with unusually strong corrugations. x 2. Same horizon (conglom.) 

 and locality. G. (Figured, Davidson, Suppl., pi. xv, fig. 24, as Sir. corrugatella.) 



Fig. 32. Leptxna rhomboidalis (Wilck.), var. a. Complete shell, pedicle-valve. x 2. Balclatchie 

 Group (conglom.), Balclatchie. G. 



Fig. 32a. Ditto. Median longitudinal section of same specimen. x 2. 



Plate XIII. 



Fig. 1. Leptmna rhomboidalis (Wilck.), var. B. Pedicle-valve. x 3. Whitehouse Group, White- 

 house Bay. G. 



Fig. 2. Ditto, var. y. Internal cast of pedicle-valve, x 1J. Starfish Bed, Drummuck Group, 

 Thraive Glen. G. 



Fig. 3. Ditto, ditto. x 2. Same horizon and locality. G. 



