PLATE II. 
Eig. 1. Prohoscina angustata (Orb.). Upper Chalk : England. 
A zoarium encrusting an echinid fragment, x 7 dia. 
Morris Coll. [50,470.] 
Fig. 2. Prohoscina ramosa (Edw.). Upper Chalk : Kent. Part of 
a zoarium encrusting Galerites alhogalems^ x 11 dia. 
Bowerbank Coll. [D. 2975.] 
Fig. 3. Prohoscina crassa (Rom.), var. alectodes. ^Middle Chalk : 
Chatham. A zoarium with well-raised peristomes and 
uniserial offshoots, x 12 dia. Vine Coll. [D. 2683.] 
Fig. 4. Prohoscina crassa (Rom.), var. alectodes. Middle Chalk : 
Chatham. Part of an irregular zoarium with many 
uniserial branches, x 6 dia. Gamble Coll. [D. 3798.] 
Fig. 5. Prohoscina crassa (Rom.), var. alectodes. Middle Chalk : 
Chatham. Part of a zoarium which in one branch 
approximates to P. fasciculata^ x 12 dia. Gamble Coll. 
[D. 3817.] 
Fig. 6. Prohoscina crassa (Rom.), var. elcvata. Middle Chalk : 
Chatham. Part of a zoarium, x 10 dia. Vine Coll. 
[D. 997.] 
Fig. 7. Prohoscina parasitica (Hag.). Middle Chalk : Chatham. 
Fig. 7a, side view, x 4 dia. ; Fig. 76, the same specimen 
from above, x 8 dia. Vine Coll. [D. 998.] 
Fig. 8. Prohoscina crassa (Rom.), var. divaricata. Lower Greensand ; ' 
Farringdon. Part of a worn zoarium, x 6 dia. Cunnington 
Coll. [60,538.] 
Fig. .9. Prohoscina anoinala, Rss. Upper Chalk : Kent. Fig. 9a, 
part of zoarium including an expansion (? gonoecial), 
x 12 dia. ; Fig. 96, part of lower part of the same, 
X 12 dia. Bowerbank Coll. [D. 2976.] 
Fig. 10. Prohoscina crassa (Rom.), var. framorum (Perg.). Middle 
Chalk : Chatham. Part of loose portion of a zoarium, 
X 8 dia. Gamble Coll. [D. 3844.] 
