418 GASTEROPODA OF THE INFERIOR OOLITE. 
356, PLeuvroromaRIA StoppartI, Tawney, 1873. Plate XXXVI, fig. 2. 
1873. PLEvRoromaria Stoppart1, Tawney. Dundry Gasteropoda, p. 50 (42), 
pl. iii, fig. 5. 
Description : 
Height (full size) : 5 . . 70 mm. 
Basal diameter 5 : : . 84mm. 
Spiral angle . ; ; : Oe. 
Shell conical, subacute, largely umbilicated. Spire regular. Whorls (nine) 
very convex, and curving each way towards the deep suture. The ornamentation 
consists of spiral lines and oblique decussating radial lines inclined, as usual, in 
opposite directions on either side of the sinus-band; the earlier whorls have a 
cancellated appearance, but in the later ones the area above the sinus-band is 
almost smooth from the absence of spiral lines and the faintness of the cross- 
hatching. 
The sinus-band is broad and situated very slightly below the middle of the 
whorls; where these possess much ornament, it exhibits three spirals which are 
cross-hatched ; in the later whorls it is flat and strap-like. The body-whorl is 
tumid and rounded at the periphery ; base rounded, full, and almost smooth, or 
only marked by curved radii springing from the deep and funnel-shaped umbilicus. 
Apex subovate. 
Relations and Distribution.—As an obvious member of the Fasciata-group this 
is most nearly related to Pl. subplatyspira, especially m the failure of ornament in 
the upper part of the whorls. But the wider spiral angle, convex whorls, and deep 
suture, serve to separate it. Viewed as a member of Deslongchamps’ compound 
species, Gyrocycla, it most nearly approaches the var. saccata, but has a much wider 
spiral angle, besides other differences. 
Apparently known only from Dundry, where the Iron-shot Oolite has yielded 
the Bristol Museum two fine specimens. 
357. Pievroromaria Amata, @’Orbigny, 1854. Plate XLIV, figs. 11 a, 11 5, 11 ¢. 
1854. Prevroromaria amara, d’Orbigny. Terr. Jur., vol. i, p. 512, pl. ccexcix, 
figs. 6—10. 
The principal objection to this identification arises from the circumstance that 
@Orbigny regarded his species as approaching Pl. wnisulcata. This is certainly 
