148 



SUPPLEMENT TO THE BRITISH 



122. Terebratula subsella, Lepnerie. Dav., Sup., PI. XIX, figs. 10, 11, 12. 



Terebratula subsella, Leymerie. Stratigraphie geol. de l'Aube, p. 249 ; Atlas, 



p. 10, fig. 5, 1846. 



— — de Loriol. In P. de L. E. Royer et H. Tombeck's Monogr. 



des Etages Jurassiques Sup. de la Haute- 

 Marne, p. 412, pi. xxv, figs. 2—20, 1872. 



— — Cotteau. Monog. de l'Etage Portlandien del'Yonue, p. 216, 



pi. xiii, figs. 11, 12, 1868. 



— — Rigaux. Notice Stratigrapbique sur le Bas Boulonnais, 



p. 20, 1365. 



— — Ogerien. Hist. Nat. du Jura, vol. i; Geol., p. 620, 1867. 



— suprajurensis, Jaccard. Desc. geol. der Jura Vaudois et Neucha- 



telois, pp. 193 et 199, 1868. 



— — Grepjrin. Desc. geol. des Jura Bernois (Materiaux pour 



la Carte Geol. de la Suisse, 8 liv.), 1870. 



— — Lennier. Etudes Geol. et Pal. sur les Falaises de la 



Haute Normandie, p. 110, 1872. 



— subsella, Struckmann. Die Pterocerasscbicbten bei Ablem ; Zeitschrift 



des Deutscben Geol. Gesell., pp. 221—227, 

 1871. 



— — D. Br aims. Obere Jura in Nordw. Deutschland, p. 371, 



1874. 



— — Douville. Fossiles du Jurassique Moyen du Berry, Bull. 



Soc. Geol. de France, 3me ser., torn, iii, p. 124, 

 1875. 



— — de Loriol. Mon. des Stages Sup. de la Formation Juras- 



sique de Boulogne-sur-Mer, Suppl., p. 236, 

 pi. xxv, figs. 17, 18, 1875. 



— — J. F. Walker. Geol. Mag., p. 574, 1876. 



Shell sub-pentagonal, rather longer than wide, broadest about the middle, valves 

 nearly equally deep. Dorsal valve biplicated at its anterior half, the rounded folds being 

 rather close and separated by a depression of moderate depth. In the anterior half of 

 the ventral valve a longitudinal fold corresponds with the median depression in the opposite 

 valve. Beak much incurved and truncated by a circular foramen lying close to the hinge- 

 line or umbone of the smaller valve. Front line M-shaped, the two central lines being 

 very much shorter than the outer one. Surface smooth. Loop in the dorsal valve 

 short. Two specimens measured — 



Length 17, width 14, depth 9 lines. 



14, 



12, 



Obs. — The discovery of this important fossil as a British species is due to Mr. J. F. 

 Walker, who found it in 1876 in the Supra-Coralline Bed or red ferruginous rock at 



