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SUPPLEMENT TO THE BRITISH 



Position and Locality. Waldheimia Morrisii occurs in the Pebble-bed at the base 

 of the upper division of the Lower Greensand at Shanklin, Isle of Wight, also in the 

 upper beds of the Kentish Rag, near Hythe. 



60. Waldheimia pseudo-jurensis, Leymerie. Sup., PI. VII, figs. 10 — 14. 



Terebratula pseudo-jurensis, Leymerie. Mem. Soc. Geol. de France, vol. v, p. 12, 



pi. xv, figs. 5, 6, 1842. 



— — Matheson. Catal., p. 131, 1842. 



— — B'Orb. Pal. Franc., Terrain Cretace, vol. iv, p. "4, 



1847. 



— — Be Loriol. Desc. des Animaux invert, foss. du Mont 



Saleve, pi. xv, figs. 19 — 21. 

 Waldheimia — Walker. Geol. Mag., vol. v, p. 405, pi. xviii, figs. 



8—10, 1868. 



Spec. Char. Shell more or less pentagonal, elongated, and somewhat flattened, 

 broadest posteriorly, attenuated anteriorly ; front straight or more or less deeply 

 indented. Dorsal valve moderately convex, depressed, or sinuated near the front ; sides 

 rounded or gently incurved towards the front. Ventral valve slightly deeper than the 

 opposite one, with a median sinus near the front, corresponding with a similar depression 

 in the opposite valve. The front and lateral portions of the shell are very much 

 thickened in some individuals, angular and acute in others ; beak moderately short, 

 incurved, and truncated by a rather small circular foramen, separated from the hinge- 

 line by a deltidium in two pieces ; beak-ridges well defined. Surface smooth, marked 

 by lines of growth ; loop elongated and reflected. 



Average length 12, breadth 9, depth 5 lines. 

 Obs. This species, like all its congeners, varies very much in shape, as may be 

 seen by the figures in Plate VII. A good deal of difference is observable in the 

 thickening and degree of indentation of the front, some specimens bearing resemblance 

 in this respect to Wold, cornuta, while others have the front line nearly straight. 



Position and Locality. In England W. pseudo-jurensis occurs in the Folkstone beds 

 of Eolkstone and Godalrning, and agrees exactly with typical examples from Marolles, 

 in France, as well as with others from the Marnes d'Aszier (Valangian stage), at Aszier 

 (Canton de Vaud), Switzerland. It is very abundant in many localities upon the 

 Continent. The matrix of the Eolkstone specimens is entirely silicified, so that by 

 grinding down the external surface of both valves to some depth the loop is completely 

 exposed and may be seen to great perfection through the transparency of the matrix ; 

 spines are likewise observable on the front of the loop, as in W. resupinata and of many 

 other species. It is very abundant at Up ware, and has been found by Mr. Meyer in the 



