W. H. Hudleston—The Yorkshire Oolite. 483 
21.—-Crriruium, near to Humpertryvum, Buvignier, 1852. Plate 
XVI. Figs. 3a, b, ¢. 
Cerithium Humbertinum, Buy., 1852, Statis. Géol. de la Meuse, p. 41, pl. xxviii. 
fig. 3 
Description.—Specimen from the Coral Rag of Brompton (Strick- 
land Collection). 
MDRTESHY Noe sth decciteinaed st OG eee 10°5 millimétres. 
PR iin hese 5, guniidd wax oe a ASD) i 55 
Bee ONG a5 a wiawisttaae «sion ee a Convex 
Shell short, pupoid, and rather stout. The state of preservation 
is unfavourable for accurate description of the spire. The whorls 
are probably nine or ten in number, and seem rather closely set. 
The ornament consists of a fine network of granulations, the number 
of transverse rows being apparently five, of which one is fainter 
than the others (see Fig. 3c). The nodes are not round as in 
Figure 1¢, but are drawn out transversely. The pillar at the base 
of the shell is just visible, but the aperture is indistinct. 
Relations and Distribution.—Whatever may be thought of the 
correlation with Buvignier’s species, the dimensions of this shell 
clearly separate it from the more ordinary forms of the limeforme- 
group. It is rare, and the specimen figured is the best known to 
me, but I have seen indications in the Ayton-Brompton Coral Rag 
of a short pupoid Cerithium, and once had an excellent specimen, 
which unfortunately was lost. I have a somewhat similar shell 
from the Coral Rag of Faringdon. 
N.B.—The enlarged Figure 30 isa restoration. In Figure 16 only 
four transverse cost should appear on the flank of the whorl, the 
remaining granulations are on the base. 
22.—CERITHIUM BICINCTUM, sp.n. Plate XVI. Figs. 4a, b. 
Description.—Specimen from the Coral Rag, probably of Langton 
Wold (Leckenby Collection). 
Meena sees cite: sete Pe AIN Oe dike e ce wishes 54 20 millimétres, 
Wate eras erie aes Ped drs tat cals 5:5 
Rperabaneleny st yy og VKis 1A 2 Potielsy as 16°. 
Shell elongated, conical, slightly turrited, sharply pointed. Spire 
consists of eighteen whorls, which increase under a regular angle 
of 16°. They are nearly flat, and but slightly separated by the 
suture. The ornaments, though faintly sculptured, are sufficiently 
characteristic, and become somewhat more pronounced in the 
anterior whorls. On the upper edge of each whorl is an irregular 
circle of faint granulations rather wide apart: below this the whorl 
is faintly ribbed spirally, and at wide intervals: towards the base, 
extending over about one-third of the height of the whorl, are two 
granulated lines. All these ornaments have about the same degree 
of prominence, the result being a delicately marked and very elegant 
shell. The base of the last whorl exhibits very fine regular trans- 
verse lines, which decussate with more wavy and irregular lines of 
growth. The aperture is somewhat imperfect, but is probably sub- 
quadrate with a short canal. 
felations and Distribution.—This species is sufficiently near to 
