186 GASTEROPODA OF THE INFERIOR OOLITE. 
It has been traced in the Cotteswolds (No. 2 district) as far as Horton Hill 
(Sodbury), where it occurs in the equivalents of the Upper Trigonia-grit. North 
of this point it has not hitherto been obtained. 
Genus—CERITHINELLA, Gemmellaro, 1878, ‘ Faune Giuresi,’ &c., p. 282. 
Shell subulate, conical-elongate, subcylindrical ; whorls numerous, nearly flat, the 
surface puckered and ornamented with spiral lines. Aperture quadrangular, with a 
very short anterior canal. 
The sheils described by Gemmellaro under Cerithinella are extremely elegant 
in form, being externally not unlike some of the more cylindrical Nerinzas, though 
internally the arrangement is quite different. The spiral system of ornamentation 
predominates. He describes and figures eight species from the crystalline Lime- 
stone of Montagne del Casale in Sicily, which appears to be of Liassic or Lower 
Oolite age. 
We have in the Lower Division of our Inferior Oolite a few extremely elegant 
Nerinzoid fossils, which display considerable resemblance to the Cerithinelle of 
Gemmellaro. The chief difference consists in the sutural sulcus being more open 
in the majority of our specimens. The group also occurs in the Lias, where it is 
represented by such forms as Cerithium confusum, Tate (‘ Geol. Mag.,’ 1875, 
p- 205), described from the Spinatus-zone of the neighbourhood of Banbury. 
Probably also some of the so-called Turritelle of the Lias might be referred here. 
If I am right in classifying our fossils under Cerithinella, the genus is perhaps 
more nearly allied to the Turritellide than to the Cerithiide. Placed by Fischer 
provisionally in the latter family. 
116. CerrrHineLta Basocrnsts, sp. nov. Plate XII, figs. 1 a, 1 6, 2, 3. 
Description : 
Length (estimated) 3 ; . 35 mm. 
Width . : _ : A 7mm. 
Spiral angle : : 2 IO? 
Shell subcylindrical, somewhat turrited ; spiral angle slightly convex at first, 
afterwards regular. Number of whorls eighteen to twenty, constricted rather 
below the middle, rising slightly towards the sutural sulcus. The subapicals 
have two nodular spiral belts, the posterior being the most prominent, and 
