482 W. H. Hudleston—The Yorkshire Oolite. 
Shell narrow, subturrited. Spiral angle moderately convex, impart- 
ing a slightly pupoid character. Whorls about eleven in number, 
ornamented with close roundish granulations, which result from the 
decussation of the spiral with the transverse ribbing, the intervening 
mesh being almost square. On the flank of the last and penultimate 
whorls the transverse cost are four in number (see Fig. le, 
which represents an enlargement of the penultimate whorl). In the 
two preceding whorls the fourth row is fainter than the others. In 
the remaining whorls no more than three cost are visible. The 
whorls are well separated, the suture being tolerably deep and wide 
for a shell of this class. Aperture involved in matrix. 
Relations and Distribution.—This shell seems to be intermediate 
between the older C. quadricinctum, Goldf., and the regular C. lima- 
forme, Roem., which, according to Buvignier, should occur above the 
‘Coral Rag. The form under description, but with variations, is 
pretty common in the Coral Rag of the Scarborough district (Seamer, 
Ayton, Brompton), but is comparatively rare in the Coralline Oolite 
of Yorkshire. 
20.—CERITHIUM, near to GRANDINEUM, Buvignier, 1852. Plate XVI. 
Figs. 2a, 5, ¢. 
Cerithium grandineum, Buv., 1852, Statis. Géol. de la Meuse, p. 40, pl. iv. fig. 2. 
Buvignier’s description and enlarged figures are satisfactory. The 
points wherein the species differs from the restricted C. limeforme 
are obvious. Buvignier’s description of C. grandineum tallies better 
with our shell than does his figure. 
Descriplion.—Specimen from the Coral Rag of the Scarborough 
district (Leckenby Collection). 
IDGWENN So uaacaadadsdoScau0d0g good uous 000" 14 millimétres. 
Greatesh: widths <.c.5 5 Seje,sciscysveye wie sisi caer wesc te laete 4°5 ,, 
Spicaleanol emermcr yeni cise aee rela Convex. 
Shell elongated, slightly turrited; spire tolerably sharp. Whorls 
about thirteen in number; rather flat, richly ornamented, and 
increasing at first under an angle of 28° (?), but becoming closer 
afterwards.. The whorls are crowded together with very little space 
for the sutures. The ornaments consist of an interlacing network of 
granulated ribbing, which is arranged so closely as to produce 
a characteristic appearance. The longitudinal coste incline but 
slightly from the axis of the spire; these decussate with transverse 
granulated coste six in number, of nearly the same degree of 
prominence (ig. 2c). The nodes at the intersections are not spiny, 
but are drawn out in the direction of the transverse ribbing, which 
alone is continued in the base of the shell. Aperture concealed in 
matrix. - 
Relations and Distribution.—If Buvignier’s figure is correctly 
enlarged, the granulations in his specimen are much finer than in 
the Yorkshire shell; in other respects there is a considerable simi- 
larity. In Yorkshire this species, or variety, does not seem to be 
common, though there are specimens in the Coral Rag of Ayton, etc., 
which approach it. 
