SUPPLEMENT, PLATE XVII. 



Disc it x hemera. 



Figs. 1 — 3. — Eeynesella ? eodbuegensis, S. Buckman. 

 Fig. 1. — Side view. Rodborough Hill, near Stroud; Lower Trigonia-giit. (Page ex.) 

 Fig. 2.— Front view. 

 Fig. 3. — Radial curve. 3 a. Outline of the lateral mouth-border. 



Figs. 4 — 6. — Retnesella juncta, 8. Buckman. 

 Fig. 4. — Side view. Bradford Abbas, "Fossil Bed." Collection of Mr. D. Stephens. 

 (Pagecix.) 



Fig. 5. — Front view. 

 Fig. 6. — Radial curve. 



Figs. 7 — 9. — Braunsella ? rotabilis, S. Buckman. 

 Fig. 7.— Side view. Bradford Abbas, "Fossil Bed." Collection of Mr. D. Stephens. 

 (Page cii.) 



Fig. 8. — Front view. 

 Fig. 9. — Radial curve. 



Figs. 10 — 12. — Darellella recticostata, 8. Buckman. 

 Fig. 10. — Side view. Bradford Abbas, " Fossil Bed." From my father's Collection. (Page cvii.) 

 Fig. 11. — Front view. 



Fig. 12. — Radial curve. 12 a. Outline of lateral mouth-border. 12b. Suture-line from another 

 example. 



Figs. 13 — 15.— Braunsina aspera, 8. Buckman. 

 Fig. 13.— Side view. Bradford Abbas, "Fossil Bed." Collection of Mr. D. Stephens. 

 (Page xcix.) 



Fig. 14. — Front view. 



Fig. 15. — Radial curves. 15 a. Outline of lateral part of aperture. 



Figs. 16 — 18. — Braunsina contorta, 8. Buckman. 

 Fig. 16. — Side view. Bradford Abbas, " Fossil Bed." (Page xcix.) 

 Fig. 17.— Front view. 

 Figs. 18, 18 a. — Radial curves. 



Figs. 19 — 21. — Braunsella semilenis, 8. Buckman. 

 Fig. 19.— Side view. Bradford Abbas, "Fossil Bed." Collection of Mr. D. Stephens. 

 (Page cii.) 



Fig. 20. — Front view. 

 Fig. 21. — Radial curve. 



Figs. 22— 24 — Darellina planaris, 8. Buckman. 

 Fig. 22.— Side view. Bradford Abbas, " Fossil Bed." Collection of Mr. D. Stephens. (Page 

 cvi.) Type; and see Suppl., PI XXII, figs. 7—9. 

 Fig. 23.— Whorl-section. 

 Fig. 24. — Suture-lines. 24 a — d. Radial lines at different periods. 



Figs. 25 — 27. — Retnesella? lineata, 8. Buckman. 

 Fig. 25. — Side view. Bradford Abbas, " Fossil Bed." (Page ex.) 

 Fig. 26. — Front view. 

 Fig. 27. — Radial curve. 



Figs. 28 — 32. — Radial Curves. 

 Fig. 28.— Brasilia bradfordensis, PI. IV, fig. 5. (Pa<;e lxxv.) 

 Fig. 29. — Hyattina sp.,*Pl. IV, fig. 7. (Page exxx.) 

 Fig. 30.— A ncolioceras? costatum, PI. VII, fig. 7. (Page xlviii.) 

 Fig. 31. — Ludwigia ambigua, PI. VII, figs. 1, 2. (Page Ixxii.) 

 Fig. 32.— Braunsella lenis, PI. VII, figs. 5, 6. (Page~cii.) 



