PLATE VI. 



Fig. Page. 



1. Bucaniella trilobata (Sow.). Internal cast. Dorsal view. X 1^. 



Wenlock Series, Dudley. Sedgwick Mus. [a/870]. 29. 



2. Ditto ?. Internal cast. Dorsal view. X 3. Upper Ludlow (Kirkby 



Moor Flags), Benson Knot, Kendal. Sedgwick Mus. 28. 



3. Ditto. Ditto. Side view. X -3. Same horizon, locality and collection. 28. 



4. Bucaniella quadrisulcata., sp. no v. Internal cast. Dorsal view. X 4. 



Llandovery Series, The Frolic, Haverfordwest. Sedgwick Mus. 30. 



5. Ditto. Internal cast. Side view. X 5. Same horizon, locality and 



collection. 30. 



6. Bucama evolitfa, sp. nov. Internal cast with portion of shell preserved. 



Side view. X 2. Balclatchio Group, Balclatchie. Mrs. Gray's 

 Coll. 31. 



6a. Ditto. Ornament. X 6. 6h. Inferior view. X 2. 6c. Dorsal view. 

 X 2. 



7. Bucania grariila, sp. nov. Internal cast with portion of shell preserved. 



Side view, X 2. Stinchar Ijimestone, Craighead. Mi's. Gray's 

 Coll. 31. 



7a. Dorsal view. X 2. 7h. Ornament. X 4. 



8. Ditto. Sinus view (shell [)reserved on left side). X 2. Same horizon, 



locality and collection. 31. 



9. Ditto. Small specimen. Side view. X 2. Same horizon, locality and 



collection. • 31. 



9a. Dorsal view. X 2. 



10. Bucania plaijf air i, sp. nov. Internal cast with })ortion of shell preserved. 



Side view. X 2. Whitehouse Group, Shalloch Mill. Mrs. Gray's 

 Coll. 32. 



10^?. Dorsal view. X 2. 10/>. Inferior view. X 2. 



11. Bucania ci. i)U)ictifron6 (Emmons). Internal cast (distorted). Dorsal view. 



X 1^. Stinchar Limestone, Craighead. Mrs. Gray's Coll. 32. 



Mn. Ornament. X 6. 



12. Kokenosjnra. credibilis, sp. nov. Dorsal view. X 4. Llandovery Series, 



Gas Works, Haverfordwest. Sedgwick Mus. 34. 



13. Ditto. Internal cast. Side view. X 2. Same horizon, locality and 



collection. 34. 



13a. Dorsal view. X 2. 



14. Ditto. Internal cast. Inferior view. X 2. Same horizon, locality and 



collection. 34. 



15. Kolcenosjnra eiqdiemoides, sp. now. Side view. X 2. Camregan Group, 



Cuddystone Glen, Girvan. Mrs. Gray's Coll. 34. 



15a. Dorsal view. X 2. 



16. Kolcenospira Uugualis (Salter). Group of three shells. X 2. Bala 



Series, Onny River. Mus. Bract. Geol. [28006]. 35. 



