162 GASTEROPODA OF THE INFERIOR OOLITE. 
84. Crriruium (species or variety). Plate IX, fig. 8. 
A single specimen from the shelly freestones of the Cotteswolds presents the 
zonal arrangement of C. Pontonis in a more complex form; the zone in the upper 
part of each whorl being made up of three granulated spirals instead of two. As 
a means of distinction merely I would propose to call this Cerithiwm ‘ cingula.” 
85. Cerrratum Wansrorpi®, sp. nov. Plate IX, figs. 9 a, 9 b, 9 ¢. 
Description : 
Length : : ; Seo mm: 
Width ; : ; 5 Seed) Taman, 
Spiral angle. ; 30°—35° 
Shell short, subconical, eae tate apex obtuse, Bat angle of increase nearly 
regular in the majority of specimens. Number of whorls about nine, flat, very 
narrow, and richly ornamented. Suture well marked. The subapical whorls are 
ornamented with from two to three spirals, whose tuberculations are fused axially. 
In the anterior whorls the richly cut spirals are three in number, the two upper 
ones being strongly tuberculate and generally fused axially. 
The body-whorl is rather more than one-third the entire length of the shell, 
and similarly ornamented ; the spiral lines on the base are finer than those on the 
flank. The aperture is subquadrate and contracted with a relatively large 
anterior canal, which is reflexed. 
Relations and Distribution — Although evidently related to C. limexforme, this 
species is, in the majority of cases, conical rather than pupoid, with a rather wide 
base for a Cerithiwm. Nevertheless, there are many connecting links. Indeed, 
the whole of the small Cerithia of the Lincolnshire Limestone are so linked by 
connecting forms that, under some aspects of the case, they might be regarded as 
one and the same species, represented by local varieties. O. Wansfordix is the 
prevailing form about Wansford and Barnack, though met with occasionally, but 
in a modified form, at the other localities. 
86. Creriraium Grorait, sp. nov. Plate IX, fig. 10. 
Description : 
Length . ; ; : ~ 125mm, 
Width : : : : SoM. 
Spiral angle ; , ; . Very convex. 
