PLATE XXV. 



Genus — Plicatula, Lamarcl'. 



Figs. 



1 — 4. P. idaeunea, Lam. Hytlie Beds, Lympne. Museum of Practical Geology, 

 No. 0781. 1, 2, 4, right valves ; 1 6, anterior outline; 3, left valve. 

 (P. 134.) 



5 — 12. P. Garferoniana, d'Orh. Lower Greensand, Upware. Riglit valves, except 

 fig. 7 (left valve); bh, 6h, anterior outlines. Figs. 6 — 9, Woodwardian 

 Museum. Figs. 5, 10—12 in Mr. J. F. Walker's Collection. (P. 135.) 



13 — 21. P. rjvrgifis, Pict. and Roux. Gault, Folkestone, except figs. 18, 21. 

 (P. 137.) 



1.3 — 1-5. Wiltsliire Collection. Eight valves ; 13 I, left valve. 

 16, 17. York Museum. Eightjvalves. 



18. Woodwardiau Museum. Gault, Cambridge. Eight valve. 



19. York Museum. Eight valve. 



20. Part of left valve of 19. 



21. Woodwardian Museiun. Cambridge Greeusaud (derived from the Gault). 



22—25. P. minufa, Seel. (P. 138.) 



22, 24. Woodwardian Museum. Cambridge Greensand. 

 23. Wiltshire Collection. Eed Limestone, Speeton. 



25. ,, ,, Eed Limestone, Hunstanton. «, outline,' natural 



size ; i!>, X 3. 



