184 SUPPLEMENT TO THE BRITISH 



Terebratula humeralis, Quenstedt. Die Brach. Deutschlands, p. 335, pi. xlv, 



figs. 84—89, 1870. 



— — De Loriol. Desc. Geol. et Pal. des Stages Supr. dela Haute 



Marne, p. 414, pi. xxv, figs. 21, 27, 1872. 



— (Waldheimia) Duv. Quarterly Journal Geol. Soc, vol. xxix, p. 197, pi. 



viii, fig. 4, 1873. 

 Waldheimia — De Loriol. Mon. Pal. Geol. des Stages supr. Formation 



Jurassique Boulonnais, p. 238, 1875. 



Shell subpentagonal, with valves moderately convex, longer than wide, and tapering 

 posteriorly, slightly pinched in laterally in its anterior half, and rounded in front. No 

 fold or sinus in either valve; surface smooth, and marked at intervals by concentric lines 

 of growth ; beak incurved, and truncated by a small circular foramen, separated from the 

 hinge-line by a deltidium in two pieces ; beak-ridges moderately defined. Ventral valve 

 most convex; dorsal valve moderately so, sometimes nearly flat. Interior not known. 

 Proportions variable ; an average-sized specimen measured — 

 Length 17, width 14, depth 9 lines. 



Obs. — I am not quite certain whether this species belongs to the genus Terebratula or 

 Waldheimia, the loop not having been hitherto described. A short and very slightly 

 indented line, extending from the umbone to about one third of the length of the smaller 

 valve, indicates the existence of a small septum, which leads me to suspect that it may 

 have possessed a long loop. The species seems to have been very much misunderstood 

 by various palaeontologists, since it has been referred to T. ventroplena and tetragona by 

 Romer, to T. carinata by Leymerie, partly to T. bucculenta by d'Orbigny, to T. pen- 

 tagonalis and T. pentagona by Quenstedt, and to T. Kimmeridgensis and T. Leymerei by 

 Deslongchamps. M. de Loriol, in his excellent work on the ' Upper Jurassic Rocks and 

 Fossils of the Haute Marne and of the Boulonnais,' gives complete synonyms and descrip- 

 tion of this species. It was first recognised as a British fossil by myself, having been found 

 in the Upper Oolites of Garty, in Sutherlandshire. In France, according to M. de 

 Loriol, it occurs in the " Calcaire a Astartes " or upper portion of the Coralline Oolite, a 

 zone underlying the Kimmeridge. 1 It is quoted by M. de Loriol from Harmeville, 

 Champcourt, &c. It abounds, according to the same authority, in the Boulonnais, and 

 particularly in the upper beds of the Etage Sequanien, but less commonly, and of smaller 

 size, in the Etage Pterocien. He adds that he has found it in abundance at Baden 

 (Argovia) in the zone of Am. tenuilobatus, and that Mr. Struchmann has recently discovered 

 it at Ahten, in the upper beds of the Terrain Sequanien, associated with Ostrea virgula. 



1 Dr. Oppel ('Die Jura') records it from the zone of Pteroceras oceana at Lindener and Tonnes 

 Berg, near Hanover. 



