70 FAUNA OF THE CORNBRASH. 



Cerithinella biserialis, sp. nor. Plate VII, figs. 14 a, 14b. 



Type. — Imperfect at apex and base ; seven whorls preserved in 9 mm. ; spiral 

 angle about 12° ; whorls flat ; sutures deep. Ornament consists of six narrow spiral 

 bands raised into knobs at intervals, commencing at the posterior end. The first 

 row of knobs overlaps the first two spirals. The second row is on the third spiral ; 

 the line between the two rows slants from the aperture. There are about twenty- 

 two pairs per whorl. The fourth spiral is scarcely raised, and appears as a dividing 

 line separating two series of knobs. The fifth spiral bears knobs as large as those 

 of the first row, but those on the sixth spiral are much smaller. The pairs of 

 knobs of the second series do not correspond with those of the first, but are rather 

 more numerous, and the lines joining them slant towards the aperture. On the 

 last whorl the fourth spiral becomes slightly knobbed, and a seventh slightly 

 knobbed spiral is developed, followed by five or more plain spirals on the base. 

 This base becomes nearly perpendicular to the outer surface of the whorl, but the 

 character of the aperture is not disclosed, being broken away. There is no um- 

 bilicus. From Shipton-on-Cherwell. In the collection of Mr. W. H. Hudleston. 



Distribution and Relations. — The type is the only specimen known. Though 

 the aperture is not seen, this appears to agree otherwise with the definition of 

 Cerithinella, and especially it agrees with the figures given by Hudleston, in his 

 pi. xii, of our own Inferior Oolite forms, in having the posterior part of each whorl 

 ornamented independently of the anterior part. 



"Cerithium" multivolutum, Piette. Plate VII, fig. 15. 



1857. Cerithium multivolutum, Piette, Bull. Soc. Geol. France [2], vol. xiv, p. 547, pi. v, figs. 17, 18. 



Type. — " Shell turretecl, lengthened, composed of a large number of narrow whorls 

 whose surface is flat or slightly convex, which appear smooth at first, and are so, 

 in fact, in many individuals ; but on specimens better preserved can be distinguished, 

 with good eyes, a range of fine granulations and some transverse striae along the 

 suture — and on the shell also can be seen pretty regular, flexuous, longitudinal 

 striae." From the marly limestone of Rumigny and Eparcy. 



Description. — The specimen here figured is imperfect at both ends. It shows 

 eight whorls in a length of 22 mm. The spiral angle is 13°. The sutures are 

 scarcely impressed, the whole surface being practically conical; they make an 

 angle of 85° with the axis. The lower part of the spire is quite smooth, but the 

 upper part shows five whorls preserving their oblique grooves (doubtless the 



