PLATE lY. 
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1. Desmepora pinnigem^ Greg. Middle Chalk : Rochester. 
Fig. la, the type-specimen, nat. size ; Fig. 16, part of one 
branch, x 7 dia. J. Simmonds Coll. [D. 7282.] 
2. H omoeosolen ramulosus Upper Chalk : loc. ? Fig. 2«, 
a worn specimen, to which a lamellibranch has grown 
attached, x 2 dia. ; Fig. 26, part of the main stem of the 
same specimen, x 10 dia. Old Coll. [D. 4576.] 
3. Fasciculipora cretacea, d’Orb. Ll'pper Chalk : Gravesend. 
Fig. 3a, a zoariiim, nat. size ; Fig. 36, end of a branch, 
X 15 dia. Bowerbank Coll. [D. 2611.] 
4. Disco fascig era Hgeriensis, d’Orb. Upper Chalk : Magee 
Island, Ireland. A zoariiim from the side ; x 10 dia. 
Presented by Jos. Wright, Esq. [D. 3278.] 
5. Discofascigera paucipora (Vine). Cambridge Greensand : 
Cambridge. Fig. 5a, the type - si)ecimen from above, 
X 12 dia. ; Fig. 56, a thin section across tlie base of the 
head of the same specimen, x 12 dia. Jesson Coll. 
[D. 1857.] 
6. Discofascigera vinei, Greg. Cambridge Greensand : Cambridge. 
The Lichenopora compressa^ ? d’Orb. of Vine. x 10 dia. 
Jesson Coll. [D. 1863.] 
7. Tholopora colUgata (Greg.). Lower Greensand : Farringdon. 
Fig. 7a, the zoariiim from above, nat. size ; Fig. 76, the 
upper surface of the end of one branch, x 8 dia. ? Baker 
Coll. [D. 7288.] 
8. Radiopora tuherculata^ d’Orb. Cambridge Greensand : Cam- 
bridge. Fig. 8a, the zoariiim from the side, nat. size ; 
Fig. 86, part of the surface of the same specimen, x 8 dia. 
[D. 3159.] 
9. Zonatula favus (Seeley). Red Chalk : Hunstanton. The 
specimen recorded by Vine as Zonopora % irregularis^ d’Orb. ; 
X 6 dia. Jesson Coll. [D. 2057.] 
10. Zonatula hrydonei^ Greg. Lower Greensand : Farringdon. 
Fig. 10a, the zoariiim from the side, nat. size ; Fig. 106, 
part of the surface of the same specimen, x 10 dia. 
Mantell Coll. [10,297.] 
