90 GASTEROPODA OF THE INFERIOR OOLITE. 
in the ‘‘ Dundry Gasteropoda,” pl. 3, fig. 8, and referred by him (p. 3) to 
P. bellona, D’Orb. 
Another variety (Pl. I, fig. 8 a, b) resembles P. Orbignyana, Héb. and Desl. 
(‘ Bull. Soc. Linn. Norm.,’ v., p. 176, pl. i, fig. 6), described by them from the 
Callovian of Montreuil-Bellay. This is a Dorsetshire specimen, but the horizon is 
unknown. 
6. Purrurina curta, sp. nov. Plate I, fig. 6 a, b. 
This is a very squat form, of which I have found one or two examples in the 
Humphriesianus-zone. The specimen figured is from Millborne Wick. 
It is not quite safe to describe this form as a variety of P. bellona, whilst its 
title to the rank of species can scarcely be regarded as proved at present. 
7. PURPURINA PARCICOSTA, sp. noy. Plate I, fig. 10 a, b. 
Description : 
Length : : : . 21mm. 
Ratio of width to levee : : . 80:100. 
Ratio of body-whorl to shell : : . 60:100. 
Spiral angle : 2 18 
Shell conoidal ; spire about four-tenths of the entire length. Whorls five to six, 
angular, and broadly tabulate. Keels coarsely crenulate, and scarcely upturned. 
Costze of the spiral whorls wide apart, and not prominent ; anterior two-thirds of 
body-whorl scarcely costated, though the coste are continuous across the flat 
area. Spirals coarse and few in number. 
Aperture ovate. Columella short, and slightly reflexed, with a very broad 
and shallow groove. Umbilicus sometimes well marked. 
Relations and Distribution—In the tabulate character of the whorls, and to a 
certain extent also in the height of the spire, this species approaches P. bellona of 
the type shown in figures 5 a—f, and the very ovate aperture, and wide and shallow 
canaliculation, still further connect it. I have, however, other specimens where the 
canaliculation is stronger, and more like that of the species next described. 
Rare in the Inferior Oolite of Dorsetshire. 
