416 GASTEROPODA OF THE INFERIOR OOLITE. 
shape of the spire and, to a certain extent, the ornamentation connect it with the 
Fasciate. 
It is abundant and characteristic in the Irony Nodule-bed (Murchisonx-zone) 
at Burton Bradstock. A smaller and more glabrous variety occurs in the 
Concavus-bed at Bradford Abbas. Tawney quotes it from Dundry. All my 
specimens indicate a fossil of the Lower Division. 
354, PLEUROTOMARIA SUBPLATYSPIRA, d’Orbigny, 1850. Plate XXXVI, fig. 1. 
1850. PiEvRoTOMaARIA suBPLATYSPIRA, d’Orbigny. Prod., i, p. 269. 
1854. — — — Terr. Jur., vol. ii, p. 496, 
pl. ccexciii, figs. 1—3. 
Syn. -— FASCIATA, var. PLATYSPIRA, Deslongchamps. Vol. cit., 
p. 54, pl. vi, fig. 2. 
Bibliography, §c.—This and the three following species constitute the Fasciata- 
group (Gyrocycla, Deslong., pars). 
Description.—A somewhat imperfect specimen from the Sauzei-bed, Milborne 
Wick, is about 44 mm. in height and width, with a spiral angle, slightly convex, of 
64°. Shell umbilicate, rather obtuse at the apex. Whorls (nine) slightly convex ; 
spirally striated in the anterior areas only, except in the extreme apical whorls, 
where the ornaments are reticulate, as is usually the case with Plewrotomariz 
belonging to this section ; sutures distinct, but not deeply impressed. The sinus- 
band is broad and slightly raised, showing but little trace of striz or growth-lines, 
even in the earlier whorls; it is flat and strap-like in the later ones, and antero- 
mesial in position. The body-whorl is almost devoid of ornamentation. 
This specimen is slightly wider than the types of Deslongchamps and 
dOrbigny. The broad submesial sinus-band at once separates it from PI. 
Amyntas and the whole of the “ narrow-slit”’ section. 
355. PLevRoToMARIA FascraTa, Sowerby, 1818. Plate XXXVI, fig. 3. 
1818. Trocuus Frascratus, Sowerby. Min. Conch., pl. cexx, fig. 1. 
1854. Prevroromarta Fascrata, Sowerby. Morris, Cat., p. 271. 
1873. — — — Tawney, Dundry Gasteropoda, p. 51 
(43). 
