974 DR F. R. C. REED ON THE 



EXPLANATIONS OF THE PLATES. 



Reference Letters. 



G. = Mrs Gray's Collection. 



E. = Geol. Surv. Museum, Edinburgh. 

 M. P. G. = Museum of Practical Geology, Jermyn Street, London. 

 B.M. = British Museum (Nat. Hist.), London. 

 H.G. = Hunterian Museum, Glasgow. 

 S.M. = Sedgwick Museum, Cambridge. 



Plate I. 



Fig. 1. Micromitra (Paterina) Davvhoni, sp. nov. Pedicle-valve, apical view, x 10. la. Side-view 

 x 10. 16. Posterior view, x 10. Balclatchie Group, Balclatchie. G. (Figured, Davidson, Suppl., 

 pi. xvi, fig. 22, as Acrotreta Nicholsoni.) 



Fig. 2. Ditto. Pedicle-valve, apical view, x 10. 2a. Side-view, x 10. 2b. Posterior view, x 10. 

 Same horizon and locality. G. 



Fig. 3. Obolus audax, sp. nov. Pedicle-valve, x 2\. 3a. Outline side-view, x 2\. Balclatchie Group, 

 Balclatchie. G. (? Figured by Davidson.) 



Fig. 4. Ditto. Pedicle-valve, x 2\. Same horizon and locality. G. (? Figured by Davidson.) 



Fig. 5. Ditto, ditto. x 2\. Same horizon and locality. G. 



Fig. 6. Ditto. Brachial valve. x 3. Same horizon and locality. G. 



Fig. 7. Ditto. Pedicle-valve, internal cast, x 2\. Same horizon and locality. [13159.] M.P.G. 



Fig. 8. Ditto. Pedicle-valve, interior. x 2\. Same horizon and locality. [4052.] M.P.G. 



Fig. 9. Obolus Maecullochi, sp. nov. Pedicle-valve. x 3. Stinchar Limestone Group, Craighead. 

 G. (? Figured by Davidson.) 



Fig. 10. Ditto. Brachial valve. x 2. Same horizon and locality. G. 



Fig. 11. Ditto. Impression of exterior of pedicle-valve 1 x 3. Same horizon and locality. G. 



Fig. 12. Ditto. Internal cast of same specimen. x 3. Same horizon and locality. G. 



Fig. 13. Ditto. Brachial valve, interior. x 2h Same horizon and locality. [118/III.] E. 



Fig. 14. Paterula balclatchiensis, Dav. Pedicle-valve. x 6. Balclatchie Group, Balclatchie. G. 

 (Figured, Davidson, Suppl., pi. xvii, fig. 41.) 



Fig. 15. Ditto, ditto, x 6. Same horizon and locality. G. (? Figured by Davidson.) 



Fig. 16. Ditto, ditto. x 6. Same horizon and locality. O. 



Fig. 17. Ditto. Impression of exterior of pedicle ? valve. x 6. Same horizon and locality. G. 



Fig. 18. Ditto. Internal cast of pedicle-valve. x 5. Same horizon, Dow Hill. G. 



Fig. 19. Ditto. Pedicle-valve. x 8. Same horizon, Balclatchie. [13109.] M.P.G. 



Fig. 20. Ditto. Brachial valve. x 10. Ballantrae Group, Bennane Head. [4337.] E. 



Fig. 21. Paterulal albida. Internal cast of pedicle-valve. ■/. 5. Whitehouse Group, Whitehouse 

 Bay. G. 



Fig. 22. Ditto. Brachial valve. x 5. Same horizon and locality. G. 



Fig. 23. Ditto. External impression of brachial valve. x 5. Same horizon and locality. G. 



Fig. 24. Ditto. Brachial valve of same specimen, with shell preserved. x 5. Same horizon and 

 locality. G. 



Fig. 25. Ditto. Internal cast of pedicle-valve. x 5. Same horizon and locality. G. 



Fig. 26. Pat<:rula% Jamesoni, sp. nov. Internal cast of brachial'? valve, x 10. Starfish Bed, 

 Drummuck Group, Thraive Glen. G. 



Fig. 27. Ditto. Interior of same specimen, x 10. G. 



Fig. 28. Ditto. Internal cast of brachial 1 valve. Same horizon and locality. G. 



Fig. 29. fihinoholusl balclatchiensis, sp. nov. Internal cast of pedicle-valve. x 2'. Balclatchie 

 < Jump, Balclatchie. G. 



