PLATE XII. 
Fig. I. Clinopora Uneata Middle Chalk : Chatham. Part 
of a branch, x 10 dia. Vine Coll. [D. 660.] 
Fig. 2. Siphoniotyphlus tenuis (Hag.). Middle Chalk : Chatham. 
Part of a narrow zoarium, x 10 dia. Vine Coll. [D. 2741.] 
Fig. 3. Clinopora sjnnigera, n.sp. Chalk Detritus : Charing, Kent. 
A zoarium, x 12 dia. T. K. Jones Coll. [D. 2821.] 
Fig. 4. Clinopora spinigera^ n.sp. Chalk Detritus : Charing, 
Kent. A thin longitudinal section, x 10 dia. T. K. 
Jones Coll. [D. 4940.] 
Fig. 5. Siphoniotyphlus tenuis (Hag.). Chalk Detritus : Charing, 
Kent. Part of a wide zoarium, x 10 dia. T. R. Jones 
Coll. [D. 2829.] 
Fig. 6g. Siphoniotyphlus plumatus, Lonsd. Middle Chalk : Chatham. 
Part of a thin longitudinal section, x 10 dia. Vine 
Coll. [D. 703.] 
Fig. 66. Siphoniotyphlus plurnatiLs, Lonsd. Upper Chalk — Zone of 
Belemnitella mucronata : Clarendon, near Salisbury. 
Upper part of a zoarium of which the lower part has 
a thin selvage and regularly pinnate apertures, x 10 dia. 
Gamble Coll. [D. 4324.] 
Fig. 7. Fetalopora pulchella {Worn.). Upper Chalk : Sussex. Part 
of a specimen figured by Lonsdale, x 10 dia. Dixon Coll. 
[B. 4485.] 
Fig. 8. Petalopora costata (Orb.). Chalk : Dover. Longitudinal 
section of the basal part of a branch, x 10 dia. Bower- 
bank Coll. [D. 7062.] 
Fig. 9. Petalopora costata {Ovh.). iMiddle Chalk : Cliatham. Fig. 9 g, 
base of a branch, nat. size ; Fig. 96, part of the same, 
X 18 dia. Gamble Coll. [D. 4514.] 
Fig. 10. Petalopora costata (Orb.). Middle Chalk : Chatham. Part 
of a branch of var. ajrpendiculata, x 10 dia. Vine Coll. 
[D. 713.] 
Fig. 11. Petalopora cunningtoni, n.sp. Lower Greensand ; loc. I 
Fig. 11a, a zoarium, nat. size; Fig. 116, branch of the 
same, x 10 dia. Presented by F. Harford, Esq. [D. 2301]. 
Fig. 12. Petalopora cunningtoni^ Lower Greensand : Farringdon. 
Longitudinal section, x 10 dia. Cunnington Coll. 
[D.5130]. 
Fig. 13. Petalopora cunningtoni^ n.sp. Lower Greensand : Farringdon. 
Part of a branch, x 10 dia. Cunnington Coll. [D. 7104.] 
Fig. 14. Siphodictyum gracile^\iQ)W^^. Lower Greensand : Folkestone. 
Fig. 14a, part of obverse surface, x 8 dia. ; Fig. 146, 
a thin slice from a branch of the same, showing longitudinal 
and transverse sections, x 12 dia. Caleb Evans Coll. 
[D. 3023.] 
Fig. 15. Siphodictyum grcLcile^\iCm^^. Lower Greensand : Folkestone.' 
Part of obverse surface of a well ; preserved specimen, 
X 10 dia. Gardner Coll. [D. 3153.] 
