ORDOVTCIAN AND SILURIAN BRACHIOPODA OF THE GIRVAN DISTRICT. 977 



Fig. 3. Ditto. Side-view of pedicle-valve, x 5. Same horizon and locality. G. 



Fig. 4. Ditto. Anterior view of pedicle-valve. x 5. Same horizon and locality. G. 



Fig. 5. Ditto. Side-view of pedicle-valve. x 5. Balclatchie Group, Balclatchie. G. 



Fig. 6. Trematis craigensis, sp. nov. Interior of brachial valve, x 2. Stinchar Limestone Group, 

 Craighead. G. 



Fig. 7. Ditto, ditto. x 2A. Same horizon and locality. G. 



Fig. 8. Ditto. Portion of surface of shell. x 15. Same horizon and locality. G. 



Fig. 9. Ditto. Impression of portion of surface of shell. x 15. Same horizon and locality. G. 



Fig. 10. Trematis melliflua, sp. nov. Brachial valve. x 4. Balclatchie Group, Balclatchie. G. 



Fig. 10a. Ditto. Portion of surface of same specimen. x 24. 



Fig. 11. Trematis siluriana, Dav. Imperfect pedicle-valve. x li Starfish Bed, Drummuck Group, 

 Thraive Glen. G. 



Fig. 12. Schizocrania asteroidea, sp. nov. Brachial valve. x 3. Starfish Bed, Drummuck Group, 

 Thraive Glen. G. 



Fig. 12a. Ditto. Portion of surface of same specimen. x 8. 



Fig. 13. Ditto. (Shell partly eroded.) < 2|. Same horizon and locality. G. 



Fig. 14. Ditto. Internal cast of brachial valve. x 2i Same horizon and locality. G. 



Fig. 15. rbiculoidea Armstrongi, sp. nov. Interior of pedicle-valve. x 3. Starfish Bed, Drum- 

 muck Group, Thraive Glen. G. 



Ditto. Impression of exterior of pedicle-valve. x 3. Same horizon and locality. G. 



Ditto. Brachial valve. x 3. Same horizon and locality. G. 



Orbiculoidea shallochensis, sp. nov. Pedicle-valve. x 5. Whitehouse Group, Whitehouse 



mui 



Fig. 



jup, 



16. 





Fig. 



17. 





Fig. 



18. 



Bay 



G. 







Fig. 



19. 





Fig. 



20. 



Ditto. Brachial valve. x 6. Same horizon and locality. G. 



Ditto. Interior of pedicle-valve. x 2|. Same horizon, Shalloch Mill. G. 



Fig. 21. Orbiculoidea stinchar ensis sp. nov. Pedicle-valve. x 3. Stinchar Limestone Group, Craig- 

 head. G. 



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



Fig. 23. Ditto. Interior of pedicle-valve. x 3. Same horizon and locality. G. 



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



Fig. 25. Orbiculoidea (Schizotretal) Forbesi, Dav. Brachial valve, x 2|. Saugh Hill Group, Wood- 

 land Point. G. 



Fig. 26. Philhedra drummuckensis, sp. nov. Upper valve, internal cast, x 3. Starfish Bed, Drummuck 

 Group, Thraive Glen. G. 



Fig. 27. Ditto. Counterpart of same specimen. x 3. 



Fig. 28. Ditto. Interior of valve. x 5. Same horizon and locality. G. 



Fig. 29. Ditto. Outline side-view of upper valve. x 3. Same horizon and locality. G. 



Fig. 30. Philhedra mullochensis, sp. nov. Internal cast of upper valve. x 2J. Mulloch Hill group, 

 Mulloch Hill. G. 



Fig. 31. Ditto, ditto. x 2\. Same horizon and locality. G. 



Fig. 32. Ditto, ditto. x 2. Same horizon and locality. G. 



Fig. 32a. Ditto. Outline side-view of same specimen. x 2. 



Fig. 33. Ditto. Internal cast of upper valve, x 2. G. 



Fig. 33a. Ditto. Portion of surface of same. x 10. 



Fig. 34. Philhedral penkillensis, sp. nov. 4. Penkill Group, Penkill. G. 



Fig. 34a. Ditto. Outline side-view of same specimen. x 4. 



Fig. 35. Philhedra Play/am, sp. nov. Internal cast of upper valve. x 2. Balclatchie Group, Dow 

 Hill. G. 



Fig. 36. Ditto. Impression of part of surface of same shell. -3. G. 



Fig. 37. Philhedra siluriana (Dav.). Internal cast, x 2|. Saugh Hill Group, Woodland Point. G. 



Fig. 38. Philhedra sp. Internal cast of upper valve. < 3. Starfish Bed, Drummuck Group. B.M. 



Fig. 38a. Ditto. Outline side-view of same specimen. x 3. 



