394 GASTEROPODA OF THE INFERIOR OOLITE. 
Pleurotomaria Dundriensis, Tawney. 
— distinguenda, Tawney. 
a serobinula, Deslongchamps. 
— Athulia, @Orbigny. 
oo Alcyone, d’Orbigny. 
There is, perhaps, no sound paleontological basis for this section, which may 
include some incomplete forms more or less allied to species classed elsewhere. 
Section 3.—Sutcate (Leptomaria, Kugéne Deslongchamps, in part). 
Shells small to middle-size, inclined to be heliciform, largely umbilicate. Spire 
variable, often very convex, apex more or less depressed. ‘The whorls have the 
ornaments but slightly engraved, and are sometimes nearly smooth. Sinus-band 
narrow, usually without spiral lines, and often sunken. The slit of the inner lip 
extends some way back. 
Pleurotomaria sulcata, Sowerby. 
= — var. obconica, Tawney. 
— Ajax, VOrbigny. 
= monticulus, Deslongchamps. 
— monticuloides, sp. nov. 
—_ sulcata-Humphriesiana, sp. nov. 
-— Amyntas, V Orbigny. 
Section 4.—Fasorara. 
Shells conical, often of large habit, umbilicus moderate to nil. Whorls 
convex or subangular, sutures distinct; spiral ornament regular, but not very 
deeply incised, decussated in the earlier whorls (decussato-striated) with a tendency 
to smoothness in some cases. The sinus-band is almost exactly median and wide, 
usually presenting a flat strap-like appearance, although in the earlier whorls the 
spiral ornamentation may sometimes be noted. 
Plewrotomaria subplatyspira, @ Orbigny. 
— fasciata, Sowerby. 
= Stoddarti, Tawney. Fasciata-group. 
-- amata, d’Orbigny. 
~- transilis, @ Orbigny. 
— Alimena, V Orbigny. 
