PLATE III. 
Fig. 1. Prohoscina hohemica, Novak, var. chathamemis. Middle 
Chalk ; Chatham. Fig. la, zoarium, nat. size ; Fig. \h, 
part of a zoarium, x 10 dia. Presented by W. Gamble, 
Esq. [D. 2978.] 
Fig. 2. Prohoscina fascicvlata (Rss.), var. toucasi (Orb.). Middle 
Chalk : Chatham. Fig. 2a, part of a zoarium, nat. size ; 
Fig. 2Z>, part of the same, x 14 dia. Gamble Coll. 
[D. 466.] 
Fig. 3. Prohoscina fascicvlata (Rss.), var. toucasi (Orb.). Middle 
Chalk : Chatham. Part of a zoarium, x 16 dia. Vine 
Coll. [D. 2669.] 
Fig. 4. Prohoscina fascicvlata (Rss.), var. toucasi (Orb.). Middle 
Chalk : Chatham. Part of a zoarium, x 8 dia. Gamble 
Coll. [D.3813.] 
Fig. 5. Prohoscina radiolitorum (Orb.). Upixir Chalk : Gravesend. 
Fig. 5a, zoarium, nat. size ; Fig. 5&, part of zoarium, 
X 15 dia. Presented by F. Harford, Esq. [D. 2300.] 
Fig. 6. Prohoscina cornucopice (Orb.). Middle Chalk : Chatham. 
Fig. 6a, zoarium, nat. size ; Fig. 66, part of a zoarium, 
X 15 dia. Gamble Coll. [D. 485.] 
Fig. 7. Filisparsa reticulata^ Orb. Middle Chalk : Chatham. Fig. 7a, 
the obverse face, x 9 dia. ; Fig. 76, part of the reverse face, 
X 9 dia. Gamble Coll. [D. 4192.] 
PTg. S. Prohoscina sarthacensis (Perg.). Middle Chalk : Chatham. 
Fig. 8a, zoarium, nat. size ; Fig. 86, part of a zoarium, 
X 14 dia. Gamble Coll. [D. 441.] 
Fig. 9. Prohoscina cornucopice. (Orb.). Middle Chalk : Chatham. 
Fig. 9a, zoarium, nat. size ; Fig. 96, part of a zoarium, 
X 12 dia. Gamble Coll. [D. 440.] 
Fig. 10. Prohoscina cornucopice (Orb.). Middle Chalk : Chatham. 
A zoarium with two broken gonocysts, x 12 dia. Vine 
Coll. [D. 2686.] 
