EXPLANATION OF PLATES. 
Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig. 6. 
Fig. 7. 
Fig. 8. 
Fig. 9. 
Fig. 10. 
Fig. 11. 
Fig. 12 
PLATE I. 
Stomatopora granulata (Edw.), var. gigantea, Perg. Upper 
Chalk : England. An unusually corrugated zoariiun 
approaching S. rugulosa. Part of a zoarium, x 5 dia. 
Old Coll. [B. 4245.] 
Stomatopora granulata (Edw.). Chalk : near Tong, Sitting- 
bourne. Two branches of a thinner zoarium, x 6 dia. 
T. E. Jones Coll. [B. 112.] 
Stomatopora granulata (Edw.), var. rugulosa (Ess.). Chalk : 
Stoke Pit, Guildford. Two parts of a zoarium, x 7 dia. 
H. Capron Coll. [D. 5147.] 
Stomatopora granulata (Edw.), var. rugulosa (E.ss.). Upper 
Chalk : Bromley. An irregular zoarium, x 10 dia. 
J. Simmons Coll. [D. 2843.] 
Stomatopora divaricata (Eom.). Chalk ; Su.ssei. Part of 
a zoarium, x 7 dia. Dixon Coll. [60,252.] 
Stomatopora granulata (Edw.). Middle Chalk : Chatham. 
Part of a zoarium with the zooecia tending towards a sub- 
piriform shape ; x 10 dia. Gamble Coll. [D. 3788.] 
'Stomatopora granulata (Edw.). Middle Chalk: Chatham. 
A zoarium in places passing to cahjpso (Orb.) ; x 10 dia. 
Gamble Coll. ’ [D. 369.] 
Stomatopora calypso (Orb.). Middle Chalk : Chatham. Part 
of a zoarium, x 10 dia. Vine Coll. [D. 953.] 
Stomatopora calypso (Orb.). Eed Chalk : Hunstanton. 
Three zooecia, x 10 dia. Jesson Coll. [D. 2015.] 
Stomatopora gracilis (Edw.). Upper Chalk : Gravesend. 
Two parts of a zoarium, x 9 dia. Wetherell Coll. [57,553.] 
Stomatopora gracilis (Edw.). Middle Chalk : Chatham. 
Part of a zoarium imbedded in an echinid plate, x 10 dia. 
Vine Coll. [D. 954.] 
Stomatopora spicea^n.^-^. Middle Chalk : Chatham. Fig. 12u 
side view, and Fig. 126 upper view, of a zoarium ; x 18 dia. 
Gamble Coll. [D. 3831. 
