978 PR F. R. C. REED ON THE 



Plate V. 



Fig. 1. Pholidops antiqua (Schloth.)? Interior of upper valve. x 6. Whitehouse Group, Shalloch 

 Mill. G. 



Fig. 2. Ditto. Internal cast. x 6. Same horizon and locality. G. 



Fig. 3. Ditto. Exterior. x 6. Same horizon and locality. G. 



Fig. 4. Pholidops implicate (Sow.). Internal cast. x 6. Saugh Hill Group, Newlands. G. 



Fig. 5. Pseudocrania midtifilosa, sp. nov. Upper valve. x 3. Starfish Bed, Drummuck Group, 

 Thraive Glen. G. 



Fig. 5a. Ditto. Outline side-view of same, x 3. 



Fig. 5b. Ditto. Portion of surface of same specimen. x 12. 



Fig. 6. Pseudocrania aff. depressa (Eichw.). Internal cast of brachial valve. x 2i Balclatchic 

 Group, Ardmillan. > G. 



Fig. 6a. Ditto. Portion of surface of same internal cast. x 8. 



Fig. 7. Orthis calligramma, Dalm., var. nov. craigensis. Complete shell, from brachial side, x \i. 

 Stinchar Limestone Group, Craighead. G. 



Fig. 8. Ditto. Brachial valve. x 1£. Same horizon and locality. G. 



Fig. 9. Ditto. Posterior view of complete shell. x 1^. Same horizon and locality. G. 



Fig. 10. Orthis calligramma, Dalm., var. nov. subplicata. Impression of exterior of brachial valve, 

 x \\. Mulloch Hill Group, Mulloch Hill Wood. G. 



Fig. 11. Ditto. Internal cast of brachial valve. x li Same horizon and locality. G. 



Fig. 12. Ditto. Impression of exterior of brachial valve. x 1-|. Same horizon and locality. [4185.] 

 M.P.G. 



Fig. 13. Ditto. Internal cast of pedicle-valve. y\\. Same horizon and locality. G. 



Fig. 14. Ditto. Impression of exterior of same pedicle-valve. x 1^. Same horizon and locality. G. 



Fig. 15. Ditto. Internal cast of pedicle-valve. < 1£. Same horizon and locality. G. 



Fig. 16. Orthis calligramma, Dalm., var J Internal cast of brachial valve. x 3. Starfish Bed, 

 Drummuck Group, Thraive Glen. G. 



Fig. 17. Ditto. Impression of exterior of same shell. x 3. G. 



Fig. 18. Ditto. Internal cast of brachial valve. x 3. Same horizon and locality. G. 



Fig. 19. Ditto. Impression of exterior of same shell. x 3. G. 



Fig. 20. Orthis Playfairi, sp. nov. Pedicle-valve. x 2. Stinchar Limestone Group, Craighead. G. 



Fig. 21. Ditto, ditto. x 2. Same horizon and locality. G. 



Fig. 22. Ditto. Brachial valve. x 2£. Same horizon and locality. G. 



Fig. 23. Ditto. Interior of brachial valve. x 1\. Same horizon and locality. G. 



Fig. 24. Ditto. Pedicle-valve. x 2. Same horizon and locality. G. 



Fig. 25. Ditto. Impression of exterior of brachial valve. x 2. Same horizon and locality. G. 



Fig. 26. Ditto. Outline side-view of complete shell. x 2. Same horizon and locality. G. 



Fig. 27. Ditto. Internal cast of pedicle-valve. x 2. Balclatchie Group, Balclatchie. G. 



Fig. 28. Ditto. Internal cast of brachial valve. x 2£. Same horizon and locality. G. 



Fig. 29. Ditto, ditto. x 2. Same horizon and locality. G. 



Fig. 30. Ditto. Pedicle-valve. x \\. Whitehouse Group, Shalloch Mill. G. 



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



Fig. 32. Ditto, ditto. x \\. Same horizon and locality. G. , 



Fig. 33. Orthis (Plectorthis) ardmillanensis, sp. nov. Pedicle-valve. x 2. Balclatchie Group (con- 

 glomerate), Balclatchie. G. 



Fig. 33a. Ditto. Median transverse section of same. x 2. 



Fig. 34. Ditto. Internal cast of pedicle-valve. x 3. Balclatchie Group, Ardmillan. G. 



Fig. 35. Ditto. Impression of exterior of brachial valve (with hinge-area of pedicle-valve), x 2£. 

 Same horizon and locality. G. 



Fig. 35a. Ditto. Portion of surface of same specimen, showing ribbing. x 6. 



Fig. 36. Ditto. Brachial valve of complete shell,. x 2. Stinchar Limestone Group, Craighead. G. 



