394 W. H. Hudleston—The Yorkshire Oolite. 
the Oxfordian stage, but does not quote it asa Corallian form. As far 
as I can make out, without having actually visited the districts, the 
chief home of the species throughout the North-East of France is to be 
sought in those highly fossiliferous beds which go by the general name 
of “ Oolithe ferrugineuse,” and which, according to Buvignier, separate 
the “ Argiles d’Oxford ” from the “Coral Rag.” Specimens sent to 
me by Dr. Barrois from about this horizon in the Ardennes are on the 
whole wider than the common Yorkshire form, and the base of the 
whorl in some of the specimens is less rounded off.’ The evidence 
seems to point to the fact that Ch. Heddingtonensis flourished earlier 
in the Franco-German areas than in Yorkshire. The species is 
pretty plentiful in the Coral Rag of Oxfordshire, but is so rare in 
the shell-bed at the top of the Lower Calcareous Grit (zone of A. 
perarmatus) at Cumnor, which is full of other univalves, that I have 
never succeeded in finding it. A narrow form which may be re- 
ferred to this species occurs in the Osmington Oolite at Weymouth, 
and more typical specimens in the Trigonia-beds. The highest 
position in which the shell has been found is the Upper Calcareous 
Grit of Silpho near Hackness. 
8.—CueEmnitzia Poxitux, D’Orbigny, 1849. Plate XIII. Fig. 2. 
Chemnitzia Pollux, D’Orbigny, 1849, Prod. de Paléont. Strat. vol. ii. p. 2. 
Id. 1850, Terr. Jurass. vol. ii. p. 62; pl. 247, fig. 1. 
Bibliography, etc.—The history of this species is a short one, as it 
seems to have been noted by few authors, unless it is concealed 
under some synonym which I have not yet been able to detect. 
Description.—Specimen from the Coral Rag of Langton Wold (my 
Collection). 
Tmeng thy @mestored) si wiaie tartan yet suena 123 millimétres. 
AEC GREE eras USK aah a Aarne NG 45 BE 53 
Length of body-whorl to entire shell ........ 38 : 100. 
Spirdlangleeiiiss Wasmund un Roe ite 25°, 
The following is D’Orbigny’s description of the species: “Shell 
elongated, conical; spire formed of a regular angle composed of 
whorls almost flat, only marked by a very slight relief of the lower 
portion almost inappreciable; feebly developed lines of growth may 
also be noted. Aperture oval, rounded in front, pointed behind, and 
furnished on the columellar region and especially below with very 
marked thickenings.” —__ 
This description fits the specimen under consideration remarkably 
well. The shell is a most complete cone, without any approach to a 
turrited shape, and the sutures are extremely shallow. It might 
* This collection, stratigraphically arranged by Dr. Barrois, is one of great interest 
and value. The general fauna of the beds in question seems to be on a level with 
the whole of our Yorkshire Coralline Oolite and Passage-beds, including part of the 
Lower Calcareous Grit, though the actual association of fossils is not exactly the 
same. The prevailing ammonites are A. cordatus and A. vertebralis in several 
phases. The representative of the group Perisphinctes is principally the small form 
pe outings in the Lower Calcareous Grit of Cayton Bay, and 4. perarmatus is very 
arce, 
