PLEUROTOMARIA. 393 
Section 1.—Contoz. 
Shells conical-elongate, not umbilicate, or having a very slight umbilical pit. 
Spire regular or concave. Whorls numerous; the body-whorl not exceeding one- 
third the total height, and often much less. Sinus-band rather narrow, often 
elevated, always anterior." Aperture oblique, depressed, and nearly always 
showing a notch or fold at the columellar extremity. 
Pleurotomaria punctata, Sowerby. 
— bicingulata, sp. nov. 
— elongata, Sowerby (typical form). 
— var. angusta. 
— — conoidea, Deshayes. 
= — LKbrayana, d Orb. 
— — turrita, Deslong. 
— abbreviata, Sowerby. 
— Agatha, VOrbigny. 
— var. Sandersu, Tawney. 
— circumsuleata, d’Orbigny. 
= subglabra, sp. nov. 
— Bessina, d’Orbigny. 
It will be remembered that the greater part of this section, with the exception 
of the first two species, were included by Deslongchamps in his Plewrotomaria 
mutabilis. 
Section 2.—BREVES. 
Shells small, conical, short ; in most cases distinctly but not strongly umbilicate. 
Spire regular or inclining to convex ; body-whorl seldom less than half the total 
height. Sinus-band submedian to anterior, and not very prominent. Aperture 
(except in Pl. Dundriensis) inclined to be subquadrate, strongly angled at the 
columnar extremity. 
1 The ornaments of the sinus-band in Plewrotomaria vary considerably even in different parts of 
the same specimen, and generally have a direct relation to the ornaments of the whorls. 
