ORDOVICIAN AND SILURTAN BRACHIOPODA OF THE GIRVAN DISTRICT. 991 



Fig. 12. Ditto. Internal cast of pedicle-valve. x 1|. Same horizon and locality. G. 



Fig. 13. Ditto. Portion of impression of surface of brachial valve. x 2£. Same horizon and 

 locality. G. 



Fig. 14. Ditto? Internal cast of brachial valve. x 2. Penkill Group, Penkill. [4104.] M.P.G. 



Fig. 15. Strophonella undata (M'Coy). Brachial valve.' x 1£. Starfish Bed, Drummuck Group, 

 Thraive Glen. G. 



Fig. 16. Ditto. Pedicle-valve of same shell, x \\. G. 



Fig. 17. Ditto. Internal cast of pedicle-valve. x \\. Same horizon and locality. G. 



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



Fig. 19. Christiania tenuicincta (M'Coy), var. nov. bilobata. Pedicle-valve. x 1|. Stinchar Limestone 

 Group, Craighead. G. 



Fig. 19a. Ditto. Side-view of same specimen. x 1£. 



Fig. 20. Strophomena antiquata (Sow.), var. nov. woodlavdensis. Pedicle-valve. x 1]-. Saugh Hill 

 Group, Woodland Point. G. (Figured, Davidson, Supp/., pi. xv, fig. 14.) 



Fig. 21. Ditto. Interior of pedicle valve. x 1^. Same horizon and locality. G. 



Plate XIX. 



Fig. 1. Strophomena antiquata (Sow.), var. nov. woodlandensis. Brachial valve. x 1^. Saugh Hill 

 Group, Woodland Point. G. 



Fig. 2. Ditto. Interior of pedicle-valve, x 1^. Same horizon and locality. G. 



Fig. 3. Ditto. Internal cast of brachial valve. x 1^. Same horizon and locality. G. 



Fig 4. Ditto. Brachial valve. x 1^. Same horizon and locality. G. 



Fig. 5. Ditto, ditto (young shell). x 1J. Same horizon and locality. G. 



Fig. 6. Strophomena deficiens, sp. nov. Internal cast of pedicle-valve. x 1^ Balclatchie Group, 

 Balclatchie. G. 



Fig. 7. Ditto. External impression of same shell. x 2. 



Fig. 8. Ditto. Portion of surface of shell, x 5. Same horizon and locality. G. 



Fig. 9. Ditto. Internal cast of brachial valve. x 1^. Same horizon, Ardmillan. G. 



Fig. 10. Ditto? Brachial valve, x 2. Stinchar Limestone Group, Craighead. [2940.] E. 



Fig. II. Strophomena shallochensis (Dav.). Pedicle-valve, x 1A. Whitehouse Group, Shalloch Mill. 

 G. (Figured, Davidson, SuppL, pi. xvi, fig. 8.) 



Fig. 12. Ditto. Brachial valve of complete specimen. Nat. size. Same horizon and locality. G. 



Fig. 12a. Ditto. Posterior view of same specimen, showing cardinal area of pedicle- valve. Nat. size. 



Fig. 12?). Ditto. Median longitudinal section of same specimen. Nat. size. 



Fig. 13. Strophomena valens, sp. nov. Impression of exterior of brachial valve, x 1£. Starfish Bed, 

 Drummuck Group, Thraive Glen. G. 



Fig. 13a. Ditto. Portion of surface of same specimen. x 6. 



Internal cast of same brachial valve. x 1|. G. 



Internal cast of pedicle-valve. x 1^. Same horizon and locality. G. 



Median cardinal region of internal cast of brachial valve. x 2. Same horizon and 



Fig. 17. Ditto, ditto x 2. Same horizon and locality. G. 



Fig. 18. Schuchertella applanata (Salt.). Internal cast of pedicle-valve. x 2^. Penkill Group, 

 Penkill. G. 



Fig. 19. Ditto. Pedicle-valve. x 1£. Same horizon and locality. G. 



Fig. 20. Ditto. Brachial valve. x 2£. Same horizon and locality. G. 



Fig. 21. Schuchertella 1 inexpectata, sp. nov. Interior of pedicle-valve. x2|. Starfish Bed, 

 Drummuck Group, Thraive Glen. G. 



Fig. 22. Ditto. Counterpart of same specimen. x 2|. G. 



Fig. 23. Schuchertella pertinax, sp. nov. Interior of pedicle-valve, x 1^. Saugh Hill Group, Wood- 

 land Point. G. 



Fig. 



14. 



Ditto. 



Fig. 



15. 



Ditto. 



Fig. 



16. 



Ditto. 



locality. 



G. 





