982 DR F. R. C. REED ON THE 



Plate IX. 



Fig. 1. Ortliis (Bilobites) biloba (Linn.). Pedicle-valve, x 4. Saugh Hill Group, Woodland Point. G. 



Fig. 2. Ditto, ditto. x 4. Same horizon and locality. G. 



Fig. 3. Orthis (Bilobites) biloba (Linn.), var. Pedicle-valve. x 4. Whitehouse Group, Whitehouse 

 Bay. G. 



Fig. 4. Ditto, ditto. x 3. Same horizon, Shalloch Mill. G. 



Fig. 5. Ditto, ditto. x 4. Same horizon, Whitehouse Bay. G. 



Fig. 6. Ditto. Brachial valve, x 5. Same horizon, Shalloch Mill. G. 



Fig. 7. Orthis (Dalmanella) basalis, Dalm. Complete shell, hrachial side. x 2. Saugh Hill Group, 

 Woodland Point. G. 



Fig. la. Ditto. Median vertical section of same specimen. x 2. 



Fig. 8. Orthis (Dalmanella) crassa, Lindstr. 1 Pedicle-valve (from squeeze). x 3. Mulloch Hill 

 Group, Mulloch Hill. G. 



Fig. 9. Ditto. Impression of exterior of pedicle-valve. x 3. Same horizon, Craigens. G. 



Fig. 10. Ditto. Internal cast of brachial valve. x 2-J-. Same horizon, Mulloch Hill. S.M. 



Fig. 11. Orthis (Dalmanella) elegantula, Dalm., var. nov. drummuckensis. Pedicle-valve (from 

 squeeze). x 2\. Starfish Bed, Drummuck Group, Thraive Glen. G. 



Fig. 12. Ditto. Internal cast of pedicle-valve. x 2|. Same horizon and locality. G. 



Fig. 13. Ditto. Brachial valve (from squeeze). x 2|. Drummuck Group, Drummuck. G. 



Fig. 14. Ditto. Internal cast of brachial valve, x 3. Starfish Bed, Drummuck Group, Thraive Glen. G. 



Fig. 15. Ditto. Portion of surface of shell (from squeeze). x 6. Same horizon and locality. G. 



Fig. 16. Orthis (Dalmanella) federata, sp. nov. Brachial valve. x 3. Stinchar Limestone Group, 

 Craighead. G. 



Fig. 17. Ditto, ditto. x 3. Same horizon and locality. G. 



Fig. 18. Ditto, ditto. x 3. Same horizon and locality. G. 



Fig. 19. Ditto. Internal cast of pedicle-valve. x 3. Same horizon and locality. G. 



Fig. 20. Ditto. Side-view of complete shell. x 2. Same horizon and locality. G. 



Fig. 21. Ditto. Anterior view of complete shell. x 2. Same horizon and locality. G. 



Fig. 22. Ditto. Internal cast of brachial valve. x 2£. Balclatchie Group, Balclatchie. G. 



Fig. 23. Ditto, var. Internal cast of pedicle-valve. x 4. Balclatchie Group, Balclatchie. G. 



Fig. 24. Ditto, var. Impression of exterior of brachial valve with cardinal area of opposite valve 

 attached. x 3. Same horizon, Dow Hill. S.M. [1068]. 



Fig. 25. Ditto, var. Impression of exterior of brachial valve. x 3. Same horizon and locality. G. 



Fig. 26. Ditto, var. Impression of pedicle-valve of same shell. x 3. G. 



Fig. 27. Ditto, var. Internal cast of brachial valve. x 3. Same horizon and locality. G. 



Fig. 28. Orthis (Dalmanellal) girvanensis, Dav. Complete shell, brachial side. x 2. Stinchar 

 Limestone Group, Craighead. G. 



Fig. 28a. Ditto. Outline side-view of same specimen. x 2. 



Fig. 29. Ditto. Complete shell, pedicle side. x 1J. Same horizon and locality. G. 



Fig. 30. Ditto. Pedicle-valve. xl|. Same horizon and locality. G. 



Fig. 31. Orthis (Dalmanellal) Ranhini, D&v. Brachial valve (from squeeze). x 2. Balclatchie Group, 

 Ardmillan. G. (Figured, Davidson, Suppl., pi. xi, fig. 17.) 



Fig. 32. Ditto. Internal cast of same brachial valve. x 2. Same horizon and locality. G. (Figured, 

 Davidson, ibid., pi. xi, fig. 18.) 



Fig. 33. Ditto. Internal cast of pedicle-valve. x 2. Same horizon and locality. G. 



Fig. 34. Ditto, ditto (with part of shell attached). x 2. Same horizon, Balclatchie. G. 



Fig. 35. Ditto. Brachial valve and cardinal area of opposite valve (from squeeze), x 2. Salne 

 horizon and locality. G. 



Fig. 36. Ditto. Internal cast of pedicle- valve. xl|. Same horizon, Dow Hill. G. 



Fig. 37. Ditto. Exterior of pedicle-valve of same shell (from squeeze). x 1£. Same horizon and 

 locality. G. 



