244 EOCENE MOLLUSCA. 
the sinus also is placed on the shoulder. The variety (fig. 3, 2) somewhat resembles 
the P. denticula of Basterot, and the other shell (fig. 3, 4) more nearly approaches the 
typical form of P. plebeia. Mr. Wood speaks of P. semicolon (Sow.) as being a 
common and well-known Barton shell; but I have never seen a specimen from that 
locality. The species appears to be limited to the Bracklesham Bay sands and the 
synchronous beds ; it is rare. 
Stize.—Axis, 7-12ths of an inch (15 millim.); diameter, 2°3-]2ths of an inch 
(5 millim.). 
Localities.—Bracklesham Bay, Stubbington, Bramshaw, Brook. French: Grignon, 
Mouchy (fide Desh.), Les Groux, Hermes, Cuisse-Lamotte, Ver, Acy-en-Mulcien 
(fide Graves). 
No. 164. Pxievroroma terra. F. £. Ldwards. Tab. XXVIII, fig. 10, a—e. 
P. testé parva, fusiformi, gracili, spiraliter lineutd, semi-costellatd: spird elevata : 
anfractibus depresso-convexis, ad humeros angulatis ; postice unico sulco profunde exaratis, 
ad suturam granulato-marginatis ; lineis spiralibus elevatis, acutis, haud distantibus ; 
costellis crebris, per-brevibus: aperturd angusto-ovali, antice in canal brevi, indistincto, 
terminanti ; sinu lato, semicirculari, in margine collocato. 
A small, slender, fusiform shell, spirally lined, and ribbed: the spire narrow, 
pointed, elevated, forming nearly two thirds of the whole length of the shell: the 
whorls flatly convex, angulated at the shoulders; the posterior margins furrowed by 
a deep sulcus, and somewhat thickened and granulated round the suture; the 
concentric lines elevated, sharp, and moderately close ; the longitudinal ribs rather 
numerous, very short, not extending beyond the middle of the whorls, narrow, 
and slightly oblique. The aperture is narrow, oval, terminating anteriorly in a wide, 
short, indistinct canal; and the sinus, which is wide and semicircular, is placed in the 
margin. 
This species is closely allied to P. infleza, but the shell is slenderer, with a more 
broadly furrowed posterior margin; the costelle also are shorter, the transverse 
lineation more prominent, and the sinus wider and more rounded. 
Size.—Axis, rather more than 3-12ths of an inch; diameter, rather more than 
}-12th of an inch. 
Localities —Stubbington and Bracklesham Bay, at both of which places it is rare. 
