ORDOVICIAN AND SILURIAN BRACHIOPODA OF THE GIRVAN DISTRICT. 983 



Plate X. 



Fig. 1. Orthis (Dalmanellal) Rankini, Dav. Internal cast of pedicle-valve. x 2. Balclatchie 

 Group, Balclatchie. G. 



Fig. 2. Ditto. Internal cast of brachial valve. x 2. Same horizon, Ardraillan. G. 



Fig. 3. Ditto, ditto. x 2. Same horizon, Balclatchie. G. 



Fig. 4. Orthis (Dalmanella) testudinaria, Dalm., var. nov. gracilis. Impression of exterior of 

 brachial valve, x 2. Balclatchie Group, Ardmillan. G. 



Fig. 5. Ditto. Impression of exterior of pedicle-valve of same shell. x 2. G. 



Fig. 6. Ditto. Impression of exterior of brachial valve. x 2J. Same horizon and locality. G. 



Fig. 7. Orthis {Dalmanella) testudinaria, Dalm., var. nov, shallochensis. Complete shell, pedicle 

 side, x 2. Whitehouse Group, Shalloch Mill. G. 



Fig. 7a. Ditto. Median vertical section of same shell. x 2. 



Fig. 8. Ditto. Brachial valve. x 2. Same horizon and locality. G. 



Fig. 9. Ditto. Complete shell, brachial side. x 2. Same horizon and locality. G. 



Fig. 10. Ditto. Internal cast of brachial valve, x 2. Same horizon and locality. G. 



Fig. 11. Ditto. Portion of surface of brachial valve. x 2. Same horizon and locality. G. 



Fig. 12. Orthis (Dalmanella) testudinaria, Dalm., var. ind. Pedicle-valve. x 3. Same horizon and 

 locality. G. 



Fig. 13. Ditto. Brachial valve. x 3. Same horizon and locality. G. 



Fig. 14. Ditto. Internal cast of brachial valve. x 3. Same horizon and locality. G. 



Fig. 15. Orthis (Dalmanella) cf. visbyensis, Lindstr. Pedicle-valve. x 1|. Saugh Hill Group, 

 Woodland Point. G. 



Fig. 16. Ditto. Internal cast of pedicle-valve. x 1|. Penkill Group, Penwhapple Glen. G. 



Fig. 17. Orthis (Rhipidomella) prematura, sp. nov. Internal cast of pedicle-valve. xl|. Starfish 

 Bed, Drummuck Group, Thraive Glen. G. 



Fig. 18. Ditto. External impression of same shell. x 2. G. 



Fig. 19. Orthis (Schizophorella) fallax, Salt. Internal cast of complete shell, pedicle-valve. x 2. 

 Starfish Bed, Drummuck Group, Thraive Glen. G. 



Fig. 19a. Ditto. Same specimen, brachial valve. x 2. 



Fig. 20. Ditto. Pedicle-valve (from squeeze). x 1|. Same horizon and locality. G. 



Fig. 21. Ditto. Anterior view of complete internal cast, x 1^. Same horizon and locality. G. 



Fig. 22.- Ditto. Internal cast of brachial valve. x 2. Same horizon and locality. G. 



Fig. 23. Ditto. Posterior view of internal cast of brachial valve. x 1|. Same horizon and 

 locality. G. 



Fig. 24. Ditto. Internal cast of complete shell, pedicle-valve. x 2. Same horizon and locality. G. 



Fig. 25. Orthis (Nicolella) Actoniee, Sow. Pedicle-valve. x I J. "Whitehouse Group, Shalloch 

 Mill. G. 



Fig. 26. Ditto. Complete shell, brachial valve. xl|. Same horizon and locality. G. 



Fig. 27. Ditto 1 Complete shell, pedicle-valve, x 1|. Stinchar Limestone Group, Craighead. G. 



Fig. 28. Orthis (Nicolella) Actonise, Sow., var. nov. asteroidea. Impression of exterior of brachial 

 valve, x 1£. Starfish Bed, Drummuck Group, Thraive Glen. G. 



Fig. 29. Ditto. Internal cast of same shell. x 1£. G. 



Fig. 30. Ditto. Internal cast of pedicle-valve. x 1£. Same horizon and locality. G. 



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



Fig. 32. Ditto. Pedicle-valve (from squeeze of impression). x 2. Same horizon and locality. G. 



Fig. 33. Ditto. Internal cast of pedicle-valve. x 1|. Same horizon and locality. G. 



Fig. 34. Ditto. Impression of exterior of brachial valve. x 2. Same horizon and locality. G. 



Fig. 35. Ditto. Posterior view of internal cast of pedicle-valve. x 2. Same horizon and locality. G. 



