402 W. H. Hudleston—The Yorkshire Oolite. 
on paleontology, and its aliases are proportionably numerous. 
There is probably, as we shall see presently, some difference in 
Cerithium Russiense, D’Orb. (Prodr., ét. 13) ; but I altogether fail to 
see the justification for the C. Struckmanni of De Loriol, still less 
for its adoption by Brauns as the representative of the species In 
North Germany. This seems to me a case where lists require con- 
siderable purgation, and it serves to illustrate at the same time the 
sort of information which a young geologist, not versed in the intrica- 
cies of synonymy, may derive from tables of fossils. 
Description. —Specimen from the base of the Coralline Oolite, 
Pickering (my Collection). 
Hengtha (restored) Nee metrvei rere silece leek Merete > 20 millimétres. 
SNAG Magee ae SwabouSad goes daca do tataded 6 
Spirallancle ey ace ecient cee hein ite 19%. 
Shell elongated, turrited, sharply pointed. Whorls probably four- 
teen in number, flat, sloping slightly, but increasing by steps; sutures 
strongly marked. The ornaments are conspicuous, and consist of 
five transverse (spiral) ribs, decussating with very numerous longi- 
tudinal ribs, which latter are nearly, but not always, in line in each 
separate whorl. 'The network or interlacing thus produced is rather 
fine; the intersections are drawn out transversely, so that the 
nodes are elongated, but not spiny. The general aspect of the 
ornamentation is closely set and regular. The transverse ribbing 
is continued over the base of the body-whorl, but without decussa- 
tion. ‘The aperture is involved in matrix. 
Relations and Distribution.—It will readily be believed that so 
common a shell must have relations in the older beds, but the whole 
subject is so confused that I cannot venture to grapple with it at 
present, though I think that this is a higher form than the next, to 
which it is closely related. At Pickering both occur together, and, 
unless in a fairly good state of preservation, would doubtless receive 
the same designation. 
It is noteworthy that, according to De Loriol and Pellat,’ both 
this and the succeeding species are found together at Viel St.-Remy 
—I presume in the ferruginous oolite. I have myself received it 
from the corresponding bed of the Ardennes. It is quoted as 
C. Struckmanni from the Séquanien of Boulogne. If there is any 
difference, De Loriol’s shell has a slightly wider base. 
As before observed, this is the common Cerithium of the Corallian 
beds throughout England, but in Yorkshire it never ascends into 
the Coral Rag. The shell-beds of the Coralline Oolite are its chief 
repository, though it, or the next species, occurs in the Lower 
Calcareous Grit. 
13.—Ceriraium Russiensr, D’Orbigny, 1845. Plate XIV. Figs. 
8a, b, ¢. 
Cerithium Russiense, D’ Orbigny, 1845, in Murchison, Verneuil and Keyserling, 2, Pp: 
453, pl. 38, fig. 9. 
Bibliography, etc.—D’Orbigny, in his Prodrome (vol. i. p. 357), 
1 op. cit. p. 76. 
