PLATE XL VIII. 
Opalinum-zone (Opalinum-beds). 
Figs. 1 — 7. — Tmetooeras soissum {Benecke). 
Fig. 1. — Side view showing distant ribs. The specimen represents a dwarf 
race of the Continental species. Burton Bradstock. My Collection. (Page 273.) 
Fig. 2. — Front view of the same specimen to show the circular whorls. 
Fig. 3. — Enlarged view of the ventral area. 
Fig, 4. — Side view of a more compressed and included form = " Begleyi,^' 
Dumortier (teste Haug). This is the specimen which was figured in the ' Proc. 
Dorset Club' as " Gosmoceras HoUandse.'^ Burton Bradstock. My Collection. 
Fig. 5. — Front view showing elliptical whorls. 
Fig. 6. — View of the ventral area, enlarged. 
Fig. 7. — Suture-line of the same specimen. 
Murchisonm-zone. 
Figs. 8 — 10. — Tmetooeras soissum {Benecke), var. 
Fig. 8. — Side view of a smaller-centred, closer-ribbed form leading to the next 
species. Broad Windsor, Dorset. My Collection. (Page 273.) 
Fisr. 9. — Front view. 
Fig. 10. — Enlarged view of the ventral area. 
Figs. 11 — 12. — Tmetooeras HoLLANDyE, S. Buchnan. 
Fig. 11. — Side view. 
Fig. 12. — Back view. This specimen was figured in the ' Proc. Dorset Club ' 
as " Gosmoceras HoUandse, var." Quarry on the Marston road, about two miles 
from Sherborne, Dorset. My Collection. (Page 275.) 
Jurense-zone (Dumortieria-beds) . 
Figs. 13 — 15. — Polymobphites sbnesoens, 8. Buchnan. . 
Fig. 13. — Side view. From the horizon of Tereb. haresjieldensis, Haresfield 
Hill. My Collection. Unique example. (Page 268.) 
Yig, 14. — Back view, showing the ribs crossing the ventral area — Blanicostan 
abdomen. 
Fig. 15. — Suture-line. 
Goncavum-zone. 
Figs. 16 — 17. — SoNNiNTA crassispinata, S. Buchnan. 
Fig. 16. — Side view of an immature form. Bradford Abbas. My Collection. 
Fig. 17. — Front view of the same. The ventral area lacks most of the hollow 
carina which is, however, complete at the bottom. 
