vill DESCRIPTION OF THE PLATES. 
Tas. XVI. 
Magnified sections of various kinds of Fossil Woods, chiefly of Palms; forming Agates, from 
the Sussex coast. (See p. 234.) 
Tas. XVII. 
Polished sections of Choanites, Corals, and Fossil Sponges; forming Agates, from the Sussex 
coast. (See p. 67 and 68, which refers by mistake to Tab. XIII.) 
Tas. XVIII. 
Fig. 1-10. Monocarya centralis. Fig. 34, Axogaster cretacea var. ? 
11 & 12. cultrata. 35+, 36 & 37. Epiphaxum auloporoides. 
13. uncertain species. 35*, Diastopora ramosa ? 
14-28. Diblasus Grevensis. 35t, 40 & 41. Alecto ramea. 
29-33. Axogaster cretacea. 38 & 39. Spinopora Dixoni. 
Tas. XVIII. A. 
Fig. 1. Alecto gracilis. Fig. 6. Desmeopora semicylindrica. 
to) to) fo) 
2. Diastopora Sowerbi. . Petalopora pulchella. 
3. ramosa ¢ 
4. Clypeina tubzeformis. 
5. Idmonea cretacea. 
pustulosa. 
OOM UD 
. Holostoma contingens. 
Tas. XVIII. B. 
Fig. 1. Diastopora ramosa. Fig. 7. Marginaria Roemeri. 
2. Siphoniotyphlus plumatus. 8. Escharina intricata. 
3-5. Homeeosolen ramulosus. 9-11. Flustra melegans. 
6. Atagma papularium. 12. Stephanophyllia Michelini. 
Tas. XIX. 
Fig. 1. Pentacrinus caput-Meduse, recent. (From the Collection of W. J. Broderip, Esq., 
F.R.S., F.G.S.) 
2. Fossil Pentacrinus, the first specimen hitherto obtained, from the Chalk. (From the 
Collection of H. Catt, Esq.) 
3-15. Portions of Chalk Pentacrini. From Sussex. 
Tas. XX. 
Fig. 1-8, 6, 7. Portions of Chalk Pentacrini. Fig. 9. Marsupites Milleri. 
4 & 5. Marsupites Miller. 10. ornatus. 
leevigatus. 11-88. Portions of Chalk Apiocrini. 
