x 
Fig 
DESCRIPTION OF THE PLATES. 
. 27. Oreaster bulbiferus. 
28. Sphere of a small oryoung Cyphosoma? 
29. Sphere of a small or young Cyphosoma? 
Fig. 30. Magnified portion of fig. 
31. Magnified portion of fig. 29. 
Tas. XXV. 
Fig. 1. Cidaris vesiculosa ; 1a, portion of spine, 
Figs. 
magnified. 
2. Spine of Cidaris serrifera ; 2 a, a por- 
tion magnified. 
3. Spine of Cidaris sceptrifera. 
4, Spine of Cidaris vesiculosa. 
5. Cidaris sceptrifera. 
6 & 7. Spines of Cidaris sceptrifera. 
8. Cidaris perornata. 
9. Section of a spine of Cidaris clavigera. 
10, 11. Cidaris clavigera. 
12. Portion of a Cidaris. 
13. Portion of sphere of Cidaris vesiculosa. 
14. Cidaris clavigera. 
Fig. 
15. Portion of a Cidaris. 
16. Sphere of a Cidaris. 
17. Cyphosoma Milleri. 
18-20. Spines of Cidaris clavigera. 
21. Portion of Cidaris vesiculosa. 
22. Cidaris clavigera. 
@ 
~) 
@ 
3-25, Salenia scutigera. 
6, 27. Cyphosoma Milleri. 
wo 0 
8. Spine and part of the head of Cidaris. 
29. Cyphosoma variolaris. 
30. Glypticus Konincku. 
31. Echinopsis pusillus. 
32 & 38. Cidaris sulcata. 
Tas. XXVI. 
1-5. Hippurites Mortoni. 
4. Fragments found at Southeram chalk-pit, near Lewes. 
5. Fragment from a chalk-pit in Kent, from the Collection of Mrs. Smith ; it shows 
the surface of one of the diverging plates between the cellular tissue of which the 
mass of the shell is composed. 
6. Portions of the vertebre of a Shark (see fig. 8 of Tab, XXXT.). 
Tas. XXVII. 
e. 1. Ostrea virgata. 
2. —— carinata, young. 
3. Gryphea globosa, var. depressa. 
A. : 
s }Crania costata. 
6. —— striata. 
7. Exogyra Rauliniana; Ostrea, D’ Or- 
bigny. 
Fi 
Hipponix, attached valves. 
oo 
5 teh 
9. Orbicula Parisiensis: a, free valve; b, 
attached valve; c, interior of free valve. 
10. Terebratula sex-radiata. 
11. —— Bulla. 
12.) Lituola nautiloidea: 6, magnified ; 
1a | c, highly magnified. 
14, Lituola? (Rotalia): 4, highly magnified. 
