90 GASTEROPODA OF THE INFERIOR OOLITE. 



in the " Dundry Gasteropoda," pi. 3, fig. 8, and referred by him (p. 3) to 

 P. bellona, D'Orb. 



Another variety (PI. I, fig. 8 a, b) resembles P. Orbignyana, Heb. and Desl. 

 (' Bull. Soc. Linn. Norm.,' v., p. 176, pi. i, fig. 6), described by them from the 

 Callovian of Montreuil-Bellay. This is a Dorsetshire specimen, but the horizon is 

 unknown. 



6. Purpdrina 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-zoTie. 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. nov. Plate I, fig. 10 a, b. 



Description : 



Length . . . . .21 mm. 



Ratio of width to length . . . 80 : 100. 



Ratio of body-whorl to shell . . . 60:100. 



Spiral angle .... 78°. 



Shell conoidal ; spire about four-tenths of the entire length. Whorls five to six, 

 angular, and broadly tabulate. Keels coarsely crenulate, and scarcely upturned. 

 Costse of the spiral whorls wide apart, and not prominent ; anterior two-thirds of 

 body-whorl scarcely costated, though the costse 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. 



