PLEUROTOMARIA. 393 



Section 1. — Conic^. 



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, alwa} 7 s anterior. 1 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. 



— — Ebrayana, d'Orb. 



— — turrita, Deslong. 



— abbreviate/,, Sowerby. 



— Agatha, d'Orbigny. 



— var. Sandersii, Tawney. 



— cir cum sulcata, 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 Pleurotomaria 

 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 Pleurotomaria vary considerably even in different parts of 

 the same specimen, and generally have a direct relation to the ornaments of the whorls. 



