pupa. 113 



convex lateral outlines, to a very blunt apex. Whorls 

 about five in number, rather short, moderately convex, 

 the penult rather large in proportion to the very short 

 body, which latter barely exceeds it in length, and almost 

 immediately slopes downwards with an abrupt but not 

 planulate declination. Suture oblique, simple, well-pro- 

 nounced. Mouth whitish, very small, filling about a 

 third of the ventral length, bluntly triangular (the angles 

 being rounded off), appearing somewhat heart-shaped from 

 the abrupt stricture which occurs on its outer lip at about 

 tsvo-fifths of the distance from its upper end, and divides 

 the lip, as it were, into a smaller and larger loop. At this 

 contraction, which produces upon the body externally, 

 a broad and conspicuous spiral indentation, and internally 

 a similar rib-like callus, there springs forth a sharp, 

 curved tooth with an upward inclination, which forms 

 nearly a circle with the first of the two laterally com- 

 pressed and nearly equal sized parietal teeth or laminae, with 

 which the almost horizontal top of the aperture is armed. 

 Pillar projecting into the aperture so greatly as to contract it, 

 and presenting the appearance of a single broad and seem- 

 ingly unarmed plate. Outer lip narrowly reflected, not 

 at all prominent above, but slanting towards the axis almost 

 from its commencement. Umbilical crevice indistinct. 



The name angustior has priority, but the species was 

 not defined under that appellation with sufficient clearness 

 to ensure identification. 



A rare shell. Near Swansea (Jeffreys) ; Cork (Hum- 

 phreys fide Jeffreys) ; Miltown Malbay in Clare (Harvey 

 fide Thompson). 



Note. — The P. cinerea of Draparnaud, a native of Southern Europe, cited as 

 British by Gray, in the Medical Repository for 1821 (vol. xv. p. 239), was 

 introduced in error, having been intermixed by Dr. Leacli with some shells col- 

 lected at Battersea. (Gray, Manual, p. 13.) 



VOL. IV. Q 



