976 DR F. R. C. REED ON THE 



Plate III. 



Fig. 1. Lingulasma 1 pidcherrimum, sp. nov. Brachial valve (with pedicle-valve displaced hehind it), 

 x 2. Balclatchie Group, Ardmillan. G. 



Fig. 2. Lingulasma 1 quxstor, sp. nov. Internal cast of brachial valve. x 2. Balclatchie Group, 

 Ardmillan Brae. G. (Figured, Davidson, Suppl., pi. xvii, fig. 20.) 



Fig. 3. Ditto, ditto, x 2. Same horizon and locality. G. (Figured Davidson, Suppl., pi. xvii, 

 fig- 21.) 



Fig. 4. Ditto. Pedicle-valve. x 2. Balclatchie Group, Balclatchie. G, 



Fig. 4a. Ditto. Portion of surface of same specimen, showing ornamentation. x 10. 



Fig. 5. Lingulasma ? tenax, sp. nov. Pedicle-valve. x 2. Saugh Hill Group, Woodland Point. G. 



Fig. 5a. Ditto. Portion of surface of same specimen, showing ornamentation. x 20. 



Fig. 6. Ditto. Brachial valve. x 2. Same horizon and locality. G. 



Fig. 7. Siphonotreta ? thraivensis, sp. nov. Pedicle-valve. x 5. Drummuck Group, Thraive 

 Glen. G. 



Fig. 8. Ditto. Internal cast of brachial valve. x 5. Same horizon and locality. G. 



Fig. 9. Schizambon scoticus (Dav.). Pedicle-valve. ■ x 2£. Stinchar Limestone Group, Craighead. G. 

 (Figured, Davidson, Suppl., pi. xvi, rig. 32.) 



Fig. 10. Ditto. Brachial valve. x 2^. Same horizon and locality. G. (Figured, Davidson, Suppl., 

 pi. xvi, fig. 33.) 



Fig. 11. Ditto, ditto. x 3. Same horizon, Minuntion. G. 



Fig. 12. Ditto, ditto. x 3. Same horizon, Craighead. G. 



Fig. 13. Ditto. Pedicle-valve. x 1\. Same horizon and locality. G. (Figured, Davidson, Suppl., 

 pi. xvii, fig. 6, as Lingula Ramsayi.) 



Fig. 14. Ditto. Umbonal region of pedicle- valve. x 4. Same horizon and locality. G. 



Fig. 15. Schizambon scoticus, Dav., var. Internal cast of brachial valve. x 2\. Starfish Bed, 

 Drummuck Group, Thraive Glen. G. 



Fig. 16. Ditto. Impression of exterior of same specimen. x 2£. 



Fig. 17. Ditto. Impression of exterior of pedicle-valve. x2|. Same horizon and locality. G. 



Fig. 18. Acrothele medioradiata, sp. nov. Internal cast of pedicle-valve. x 5. Balclatchie Group, 

 Balclatchie. G. 



Fig. 19. Ditto. Impression of exterior of same specimen. x 5. 



Fig. 20. Ditto. Internal cast of pedicle-valve. x 3. Same horizon and locality. [13105.] M.P.G. 



Fig. 20a. Ditto. Outline side-view of same specimen. x 3. 



Fig. 21. Ditto. Internal cast of pedicle-valve. x 3. Same horizon and locality. [13104.] M.P.G. 



Fig. 22. Ditto. Interior of brachial valve. x 4. Same horizon and locality. G. 



Fig. 23. Acrothele ? sp. a. Brachial valve. x 5. Same horizon and locality. G. 



Fig. 24. Ditto ? Brachial valve. x 5. Same horizon and locality. G. 



Fig. 25. Ditto ? ditto. x 5. Same horizon, Ardmillan. G. 



Fig. 26. Acrothele (Redlichellal.) sp. b. x8 Same horizon, Balclatchie. G. 



Fig. 27. Ditto. x 8. Same horizon and locality. G. 



Fig. 28. Acrotreta% sp. a. Brachial valve. x8. Stinchar Limestone Group, Craighead. G. 



Fig. 29. Acroiretal sp. b. Interior of brachial valve. x 5. Same horizon and locality. G. 



Fig. 30. Ditto. Counterpart of same specimen. x 5. 



Fig. 31. Ditto. Interior of brachial valve. x 5. Bennane Burn, R. Stinchar. [2809.] E. 



Plate IV. 



Fig. 1. Conotreta conoidea, sp. nov. Pedicle- valve, posterior view. x 5. Stinchar Limestone 

 Group, Craighead. G. (Figured, Davidson, Suppl., pi. xvi, fig. 21, as Acrotreta Nicholsoni.) 



Fig. 2. Ditto. Interior of pedicle-valve (partly exposed by removal "of shell). x 4. Same horizon 

 and locality. G. 



