986 DR F. R. C. REED ON THE 



Fig. 3a. Ditto. Outline side-view of same specimen. x 2. 



Fig. 4. Ditto, var. 8. Pedicle-valve. x 1£. Mulloch Hill Group, Mulloch Hill. G. 



Fig. 5. Ditto, var. c. Pedicle-valve. x 1^. Saugh Hill Group, Woodland Point. G. 



Fig. 6. Ditto, var. e. xlj, Same horizon and locality. G. 



Fig. 7. Ditto, var. e, ditto (young shell), x 2. Same horizon and locality. G. 



Fig. 8. Ditto, var. £, ditto. x 1£. Penkill Group, Penkill. G. 



Fig. 9. Ditto, var. £, ditto. x 2. Same horizon and locality. G. 



Fig. 10. Leptella Graym (Dav.). Pedicle-valve of complete shell. x 1|-. Stinchar Limestone Group, 

 Craighead. G. (Figured, Davidson SuppL, pi. xii, fig. 25.) 



Fig. 11. Ditto. Brachial valve of complete shell. x 2. Same horizon and locality. S.M. [1072.] 



Fig. 12. Ditto, ditto. x 2. Same horizon and locality. G. (Figured, Davidson, Suppl., pi. xii, 

 %• 23.) 



Fig. 12a. Ditto. Posterior view of same specimen. x 2. 



Fig. 13. Ditto. Right half of pedicle-valve. x 2. Same horizon and locality. G. 



Fig. 14. Ditto. Interior of brachial valve. x 1£. Same horizon and locality. G. 



Fig. 15. Ditto?, ditto. x \\. Same horizon and locality. G. (Figured, Davidson, Suppl., pi. xii, 

 fig. 27, as Leptx.ua llandeiloensis.) 



Fig. 16. Ditto, ditto. x 1|. Same horizon and locality. G. 



Fig. 17. Ditto. Internal cast of pedicle-valve. x 2. Balclatchie Group, Balclatchie. G. (Specimen 

 named by Davidson as Leptsena Grays). 



Fig. 18. Leptella 1 pseudoretroflexa, sp. nov. Complete shell, brachial valve. x 2. Balclatchie Group, 

 Balclatchie. G. 



Fig. 18a. Ditto. Posterior view of same specimen. x 2. 



Fig. 186. Ditto. Median longitudinal section of same specimen. x 2. 



Fig. 19. Ditto. Interior of pedicle-valve. x 2. Balclatchie Group, (conglom.), Balclatchie. G. 



Fig. 20. Ditto, ditto. x 2. Same horizon and locality. G. 



Fig. 21. Ditto. Brachial valve. x 2. Same horizon and locality. G. 



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



Fig. 23. Ditto, ditto. x 1|. Same horizon (conglom.), Balclatchie. G. 



Fig. 24. Ditto, ditto. x 2J. Same horizon, Ardmillan. G. 



Fig. 25. Ditto. Internal cast of pedicle-valve. x 2£. Same horizon and locality. G. 



Fig. 26. Ditto, ditto. x 2. Same horizon and locality. G. 



Fig. 27. Plectambonites Etheridgei (Dav.). Interior of brachial valve. x 2. Stinchar Limestone 

 Group, Craighead. G. (Figured, Davidson, Suppl., pi. xii, fig. 12.) 



Fig. 28. Ditto. Pedicle-valve, x 1£. Same horizon and locality. G. 



Fig. 29. Ditto. Complete shell, brachial side. xl|. Same horizon and locality. G. 



Fig. 29a. Ditto. Median longitudinal section of same specimen., x 1£. 



Fig. 30. Ditto. Interior of brachial valve. x 2. Same horizon and locality. G. 



Fig. 31. Ditto. Internal cast of imperfect pedicle-valve. x 1\. Same horizon and locality. G. 



Fig. 32. Plectambonites llandeiloensis (Dav.). Internal cast of both valves of one individual, x 3. 

 Balclatchie Group, Ardmillan. G. (Figured, Davidson, Suppl., pi. xii, fig. 26.) 



Fig. 33. Ditto. Internal cast of pedicle- valve. x 3. Same horizon and locality. G. 



Fig. 34. Ditto, ditto, x 3. Same horizon and locality. G. 



Plate XIV. 



Fig. 1. Plectambonites llandeiloensis (Dav.). Pedicle- valve, x 1\. Balclatchie Group, Ardmillan. G. 

 (Named by Davidson Leptsena scissal) 



Fig. 2. Ditto. Internal cast of brachial valve. x 3. Same horizon and locality. G. 



Fig. 3. Ditto, ditto, x 2f. Same horizon and locality. G. 



Fig. 4. Plectambonites quinquecostata (M'Coy), var. nov. balclatchiensis. Pedicle- valve, x 2. Bal- 

 clatchie Group, Balclatchie. G. 



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



