J. S. GARDNER ON BRITISH CRETACEOUS rATELLID.E ETC. 205
Fig. 17. Scurria depressa, sp. nov. Same locality.
Pig. 18. Tectara tenidstriata, Seeley. Gault, Cambridge ; Woodwardiau
Museum. Figs. 19, 20. Tectum tenuicosta, D'Orb. Gault, '^Folkestone ; Gardner
collection. Figs. 21, 22, 23. Crepidula gaultina, Buvignier. Gault, Folkestone ;
Gardner collection. Fig. 24. Pileopsis dubia, sp. nov. Gault, Folkestone ; Gardner collection. Fig. 25. Calyptraa Grayana, Tate. Upper Chalk, Ireland ; Jermyn-street
Museum. Fig. 26. Helcion, sp. ? Buck Hill, Bedfordshire, probably derived from
the Kimmeridge Clay. Figs. 27, 28, 29, 30. Calyptrcsa concentrica, sp. nov. Gault, Folkestone.
Plate VIII.
Fig. 1. Emarginida neocomiensis, D'Orb. Neocomian specimen from the
Leckenby collection. Atherfield. Fig. 2. Ditto, side view. Fig. 2 a. Part of same, enlarged.
Fig. 3. Ditto, specimen from the British Museum. Seend. Fig. 4. Ditto, side view.
Figs. 5. 6. Specimens from the Jermyn-street Museum. Atherfield. Fig. 6 a. Part of same, enlarged. Figs. 7, 8, 9. Emarginida valangiensis, Pict. & Camp. Neoconrian. Mr.
Meyer's collection. East Shalford. Figs. 10, 11. Emarginida puncturella, sp. nov. Neocomian. Mr. Meyer's
collection. Figs. 11 a, lib, lie. The same, enlarged. Figs. 12, 13. Emarginida Gresslyi, Pict. & Camp. Grey Chalk. Gardner
collection. Figs. 14, 15."' Emarg inula Meyeri, sp. nov. Chloritic Marl, Lyme Eegis.
Mr. Meyer's collection. Figs. 16, 17. E. Gresslyi. Lower Chalk, Isle of Wight.. Jermyn-street
Museum. Fig. 18. Ditto. Upper Greensand, Devizes. Jermyn-street Museum. Figs. 19, 20. E. divisiensis, sp. nov. Upper Greensand, Devizes; British
Museum. Figs. 21, 22. E. sanctce-catharincs, Passy, from the Chloritic Marl of
Whitemore ; Jermyn-street Museum. Figs. 23, 24. E. ancistra, sp. nov. Upper Greensand, Roundway, near
Devizes ; British Museum. Figs. 25, 26. E. unicostata, Seeley, MS. Upper Chalk, Norwich ; Wood-
wardian Museum. Fig. 27. Tectum plana, sp. nov., nat. size. Neocomian. Mr. Meyer's
lection. Figs. 28, 29. The same, enlarged.
Plate IX.
Figs. 1, 2. Cmcibulum giganteian, sp. nov. Neocomian, Hythe ; Gardner
collection. Figs. 3, A, 5. Anisomyon vectis, sp. nov. Neocomian, Atherfield ; Wood-
wardian Museum. Figs. 6, 7, 8, 9. Pimcturella antiqua, sp. nov. Upper Greensand, Devizes ;
British Museum. Figs. 10, 11. Tectum formosa, sp. nov. Lower Greensand, Shanklin. Mr.
Meyer's collection. Figs. 12, 13. Hipponyx Dixoni, Deshayes. Chalk ; Jermyn-street Museum.
