PLATE XXVIII. 



Genus — Dosiniopsis, Conrad. 



Figs. 

 1 — 6. D. subrotunda (Sow.). Upper Greensand, Blackdown. Sedgwick 

 Museum, Cambridge; except fig. 2, British Museum, No. L170G7. 

 (P. 181). 



1, 2, 6. Eight valves. 



3. Interior of right valve X H. 

 4, 5. Left valves. 5 b, interior of 5 a. 



7 — 10. D. caperata (Sow.). Upper Greensand, Blackdown. Sedgwick Museum. 



(P. 182). 



7,8. Eight valves. 7 b, hinge X 1|. 

 9, 10. Left valves. 10 1>, interior of 10 a ; 10 c, dorsal view. 



Genus — Cyprimeria, Conrad. 



11 — 18. C. (Cyclorisma) vectensis (Forbes). Lower Greensand (Crackers), 

 Atherfield. Sedgwick Museum. (P. 18Z.) 



11, 12. Eight valves. 11 b, dorsal view of lie 



13, 14. Hinges of right valves. 13, a small specimen x 2. 



15, 16. Left valves. 



17. Hinge of left valve x 1|. 



18. Internal cast of right valve. Exact horizon not known. 



L9 — 23. C. {Cyclorisma) parva (Sow.). Lower Greensand (Crackers), Atherfield. 

 Sedgwick Museum. (P. 184.) 



19 a, right valve ; b, dorsal view of both valves. 

 20. Hinge of right valve x 3. 

 21 — 23. Left valves. 21 b, part of 21 a near the ventral margin x 4. 



