PLATE 5 
Fics. 1 a-d, 2a-d. Rhynchonella sp. Callovian. Wrzova, Poland. B.M. BB. 44148-9. 
Fics. 3 a-d, 4 a-d, 5,6. Rhynchonella rivelensis Loriol. Upper Oxfordian. Alex near 
Oyonnax (Ain), France. B.M. BB. 44150-53. 
Fics. 7 a-d, 8 a-d, 9 a-c. Thurmannella obtrita (Defrance). Oxfordian, (Terrain a 
Chailles). Pagny-sur-Meurse (Meurthe et Moselle), France. B.M. BB. 44154-56. Figs. 8 
a—d neotype. 
Fics. 10 a-d. Thurmanella acuticosta sp. nov. Oxfordian, (Lower Calcareous Grit). 
Filey Brigg, Yorkshire, England. Holotype. B.M. BB. 44158. 
Fics. 11 a-d. T.acuticostasp.nov. Paratype. Details as fig. 10. B.M. BB. 44157. 
Fics. 12 a-d. Acanthothiris spinosa (Linnaeus). Neotype. Bajocian, (Upper Tvigonia 
or Clypeus Grit). Rodborough Hill, Gloucs., England. B.M. BB. 45400. 
Fics. 13 a-d. A.spinosa (Linnaeus). Bajocian, (Upper Tvigonia or Clypeus Grit). Stroud, 
Gloucs., England. B.M. B. 63318. 
Fics. 14 a-d. A. spinosa (Linnaeus). Juvenile specimen. MBajocian, (Upper Tvrigonia 
Grit). Waterworks Quarry, Wotoon under Edge, Gloucs., England. B.M. BB. 44162. 
Fic. 15. A. spinosa (Linnaeus). Crushed specimen showing spines attached. Upper 
Bathonian, (“‘ Varians Schichten ’’). Liestal near Basel, Switzerland. B.M. BB. 44160. 
Fics. 16 a-d, 17 a-d. A. spinosa (Linnaeus). Details as fig. 15. B.M. BB. 44161 and 44159. 
