EXPLANATION OF THE PLATES. SI 5 



TABLET XXII. 



Ammonites, and Scaphites, from the chalk and chalk marl, near Lewes. 

 Fig. 1. Ammonites Mantelli, p. 113. 



Fig. 2. Lewesiensis, p. 199. 



Figs. 3, 4, 9, 11, 13. Various specimens of Scaphites striatus, p. 119. 

 Fig. 5. Ammonites cdtihm, p. 198. ' <? '^ ^ " ^ ' ^' 



Fig. 6. biplicatus, from the Blue marl, p. 91. 



Fig. 1: Woollgari, in a young state, p. 197. 



Figs. 8, 12. Scaphites costatus, p. 120. 

 Fig. 10. Ammonites catinus, p. 198. 



Figs. 14, 15. Different views of a pyritous cast of the inner volutions of Scaphites striatus, 

 p. 119. 



Fig. 16. Section of a cast of Scaphites striatus. 



TABLET XXm. 



Hamites, and Turrilites, from the chalk marl in the vicinity of Lewes. 

 Figs. 1, 2. Hamites plicatilis, p. 121. 



Fig. 3. View of the foUaceous structure of the septa in Hamites armatus, p. 121 . 

 Fig. 4. Hamites armatus, from the grey marl at Hamsey. 

 Fig. 5. Fragment of a large Hamite, p. 121. 

 Figs. 6, 7. Hamites baculoides, p. 123. 

 Figs. 8, 13. Portions of Hamites attenuutus, p. 122. 

 Fig. 9. Hamites ellrpticus, p. 122. 

 Figs. 10, 11. Hamites alternatus, p. 122. 

 Fig. 12. Hamites intermedius ; from the Blue marl, p. 93. 

 Figs. 14, 16. TurrUites undidatus, p. 124. 

 Fig. 15. costatus, p. 123. 



TABLET XXIV. 



Turrihtes from the Grey chalk marl, near Lewes. 



Figs. 1, 4, 5. Turrihtes costatus, p. 123. 



Fig. 2. View of the base of a wreath of Turrilites tuberculatus, p. 124. 



Fig. 3. A variety of T. tuberculatus, p. 124. 



Fig. 6. Perspective view of a specimen of T. tuberculatus. 



Fig. 7. Turrilites tuberculatus, from Middleham ; exposing the situation of the siphun- 

 culus, p. 124. 



Fig. 8. A very fine specimen of Turrihtes undulatus, from Hamsey, shewing the rounded 

 termination of the coliunella, p. 124. 



S S 2 



