JURASSIC AND TRIASSIC BRACHIOPODA. 153 



character. It is remarkable on account of its peculiar broad fold, the sharp edges of its 

 valves, and short beak. The absence of biplication distinguishes it from T. infra-oolitica, 

 although Mr. E. Deslongchamps figures under that designation (PI. 58, fig. 5 of his 

 1 Brachiopodes Jurassiques ') a specimen which bears some resemblance to the shell under 

 description. The absence of biplication distinguishes it likewise from T. mbmaxillata. 

 One example among Mr. J. F. Walker's specimens shows a tendency to the formation of 

 short, irregular plications round the margin of the valves, but this was no doubt due to 

 malformation. Ter. WhitaJceri occurs in the Oolitic Marl (Inferior Oolite) of Leck- 

 hampton Hill, near Cheltenham. Mr. Walker has named this species after his friend, 

 Mr. W. Whitaker, F.G.S., editor of the • Geological Record.' 



128. Terebratula curvifrons, Oppel. Dav., Ool. Mon., PI. IY, figs. 15, 16 ; Appendix 



to Vol. I, PI. A, fig. 17 ; Sup., PI. XXIV, fig. 33. 



Terebratula resupinata, Quenstedt (pars). Handbuch der Petrefactenkunde (Br. 



Jura), p. 469, tab. xxxvii, fig. 38, 

 1851 (not T. resupinata, Sow.). 



— carinata, Dav. (pars). Ool. Mon., p. 35, pi. a, fig. 17, 1855. 



— — De Ferry. Note sur l'fitage Bajocien des Environs de 



Macon., p. 13 ; Mem. Soc. Linn, de Nor- 

 mandie, vol. xii, 1861. 



— curvifrons, Oppel. Die Jura-Formation, p. 423, 1857. 



— Brebissoni, E. Besl. Bull. Soc. Linn.de Normandie, vol. vii, p. 321, 



1862, and Etudes Critiques sur les Brachio- 

 podes Nouveaux ou peu Connus, 3rd fascicule ; 

 Bull. Soc. Linn, de Normandie, vol. viii, 

 p. 251, pi. ix, figs. 1—8. 



— (epithyris) curvifrons, E. Besl. Brach. Jur., p. 187, pi. xlix, figs. 



1—8, 1864. 



Shell broadly subpentagonal, as wide as long or a little longer than wide, slightly 

 indented in front. Dorsal valve moderately convex, especially at the umbone and lateral 

 portions of the valve ; divided into two parts by a groove or depression of moderate depth, 

 commencing at a little distance from the umbo, and widening as it approaches and 

 reaches the front. Ventral valve deep and keeled; beak moderately produced, and 

 truncated by a rather large foramen, margined anteriorly by a small deltidium in two 

 pieces; beak ridges well defined. Surface smooth, marked at intervals by concentric 

 lines of growth. 



Length nearly 2 inches; width 1 inch 9 lines; depth 11 lines. 



Obs. — The loop is not known, but Mr. Deslongchamps surmised from external 

 appearances, and the absence of a dark longitudinal line along the middle of the umbone, 



20 



