PLATE XVII. 
Pig, 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig, 6. 
Fig. 7, 
Fig. 8. 
Fig. 9. 
Fig. 10. 
Fig. 11. 
Clausa globulosa (Orb.). Upper Chalk : Bromley. Fig. la,, 
a zoarium of var. tenuicaulata, nat, size ; Fig. 16, the 
head of the same, x 12 dia, ; Fig. Ic, part of the stem 
of the same, x 12 dia. Bowerbank Coll. [D. 3089.] 
Clausa globulosa {Ovh.). Middle Chalk : Chatham, Fig. 2a, 
a zoarium of var. crassicaulata^ nat, size ; Fig. 26, the 
head of the same, x 8 dia. ; Fig. 2c, part of the stem of 
the same, x 8 dia. Gamble Coll. [D. 4555.] 
Clausa globulosa (Ovh.). Upper Chalk: South-East England. 
Head of a zoarium, x 10 dia. Toulmin Smith Coll. 
[D. 4556.] 
Clausa globulosa (Orb.). Middle Chalk : Chatham. Part 
of a zoarium with high peristomes, x 10 dia. Gamble 
Coll. [D. 4563.] 
Clausa globulosa (Orb.). Middle Chalk : Chatham. Part 
of a zoarium of var. crassicaulata, with long, free 
peristome ; x 10 dia. Gamble Coll. [D. 4559.] 
Clausa globulosa (Orb.), Middle Chalk : Chatham. Base 
of a zoarium of form elegans, x 6 dia. Gamble Coll. 
[D. 4100.] 
Cryptoglena gamblei, n.sp. Middle Chalk : Chatham. Fig, 7a, 
a zoarium, nat, size ; Fig. 76, part of the same, x 12 dia. 
Gamble Coll. [D. 4064.] 
Clausa globulosa {Orb.). Middle Chalk : Chatham. Fig. 8a, 
base of a zoarium, nat. size ; Fig. 86, the same from the 
side, X 2 dia. Gamble Coll. [D. 4197.] 
Cryptoglena gamblei^ n.sp. Middle Chalk : Chatham. A 
zoarium, x 2 dia. Gamble Coll. [D. 4260.] 
Clausa globulosa (Orb,). Middle Chalk : Chatham. A 
branch of the form elegans^ x 6 dia. Vine Coll. [D. 628,] 
Clausa heteropora (Orb.). Middle Chalk : Chatham. A 
branch of var. obliqua, x 10 dia. Vine Coll. [D. 6*99,] 
