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SUPPLEMENT TO THE BRITISH 



Greensand of Ireland. It is a common fossil in many Neocomian localities of France, 

 Switzerland, and Germany. 



It is with some uncertainty that the specimens from Tealby (pi. vii, figs 5 to 9) are 

 placed with the species or variety under description. 



63. Waldheimia (?) Hibernica, Tate. Sup., PL VII, figs. 21, 21«, 210. 



Terebratula (Waldheimia) Hibernica, Tate. Quart. Journal Geol. Soc, vol. xxi, 



p. 42. pi. v, fig. 3, 1865. 



Spec. Char. Shell small, ovate, longer than wide ; valves moderately convex, with a 

 small depression close to the front in the dorsal valve. Ventral valve slightly deeper 

 than the opposite one ; beak of moderate size, incurved, and truncated by a circular 

 foramen, separated from the hinge-line by a small deltidium in two pieces. Surface 

 smooth, marked by a few concentric lines of growth. Average length 5, breadth 4^, 

 depth 4 lines. 



Obs. The few specimens which I have been able to examine presented in most 

 cases a small depression close to the front, giving to the shell a slightly biplicated 

 appearance. This feature has not been represented in Mr. Tate's figure. The front is 

 rounded in some specimens. 



Mr. Tate states that his species is most nearly allied to W. tamarindus, but differs 

 from it in its more oblong form, Implication close to the front of the upper valve, 

 smaller foramen, greater development of the deltidial plate, and more obscure beak- 

 ridges. The loop is not known, so that the species is only provisionally placed in the 

 genus Waldheimia. 



Position and Locality. Common in a compact Chloritic Sandstone in Colin Glen , 

 Ireland, or " Zone of Exogyra columba " of the Hibernian Greensand (see p. 46). 



64. Waldheimia Juddii, Walker. Sup., PL VII, figs. 15 — 18. 



Waldheimia rhomboidea, Walker. Geol. Mag., vol. v, p. 400, pi. xviii, figs. 3, 3a, 



3h, and 4, 18G8. 

 — Juddii, — lb., vol. vii, p. 5G2, 18/0. 



Spec. Char. Obscurely rhomboidal, longer than wide ; valves equally convex or 

 deep ; greatest breadth of the shell near the middle, thence gradually tapering towards 

 the beak and front. Ventral valve uniformly convex, without sinus ; beak small, 

 incurved, and truncated by a moderately sized foramen ; deltidium small ; beak-ridges 

 sharply defined ; dorsal valve regularly convex to about half its length from the umbo, 

 when a rounded mesial fold of small elevation rises gradually and extends to the front ; 



