422 GASTEROPODA OF THE INFERIOR OOLITE. 
363. Prevrotomaria ALLICA, d’ Orbigny, 1850. Plate XXXVI, figs. 5, 5a. 
1850. Puievroromaria Arica, d’Orbigny. Prod., i, p. 268. 
1854. — — = Terr. Jur., vol. ii, p. 490, pl. ecexe. 
1873. —_— — — Tawney, Dundry Gasteropoda, p. 42 
(34). 
Description : 
Height (large specimen) ‘ ; . 55 mm. 
Basal diameter ‘ : . . 45 mm. 
Spiral angle . : : . 48°—52°. 
Shell conical, elongate, not umbilicated. Spire regular. Whorls (about nine) 
flat to subconvex, and slightly projecting over each other. There is some differ- 
ence of ornamentation between the apical and anterior whorls; generally the 
system may be described as consisting of rather wide-apart spirals above the sinus- 
band, with a stronger and more decussated pattern below, 7. e. the anterior portion 
of each whorl is minutely cancellate down to the sutural margin. 
The sinus-band is median or only slightly anterior, fairly prominent in the 
apical whorls, flattish and not very wide in the more advanced ones. The body- 
whorlis between one third and one half the total height, and bluntly angular at the 
periphery ; base flat to subconvex, with distinct spiral ornament and no umbilicus. 
Aperture subquadrangular and moderately oblique, with a very thick columellar lip. 
Relations and Distribution.—Pl. Allica must be regarded as a member of the 
Fasciata-group, having a narrow spiral angle and a comparatively small habit. 
Its relationship to Pl. Alimena is obvious. 
Tawney mentions one specimen from Dundry; I have five from the Louse 
Hill beds, which are generally regarded as in the upper part of the Hwmphriesianus- 
zone. 
364. PLEUROTOMARIA SUBRETIOULATA, @’Orbigny, 1850. Plate XXXVI, figs. 6, 6 a, 
and ? fig. 7. 
1850. PLEUROTOMARIA SUBRETICULATA, d’Orbigny. Prod., i, p. 268. 
1854. — — — Terr. Jur., vol. ul, p. 494, 
pl. ecexeii, figs. 1—5. 
1873? — — _ Tawney, Dundry Gastero- 
poda, p. 46 (38), pl. iii, 
fig. 7. 
Syn. — RETICULATA, Deslongchamps. Vol. cit., p. 64, pl. ix, fig. 3. 
