10 PHILINE. 
the absence of information leave it independent for the present. 
It is a larger shell than this. 
P. vAILLANTI Issel. Unfigured. 
Shell oblong, longitudinally unequally wrinkle-striated, thin, 
fragile, a little shining, milky-transparent, translucid, with clear 
bands; convex outside, ovate; inside spirally convoluted ; apex ex- 
cavated or perforate ; whorls 1-14; aperture large, the outer mar- 
gin strongly arcuate, simple, acute, projecting a little above the 
apex ; inner margin having a very thin whitish callus. Alt. 27, 
diam. 20 mill.; alt. 24, diam. 19 mill. (Jsse/). 
Suez, ete., (Issel). 
P. vaillanti Issru, Mal. Mar Rosso, p. 166, (1869).=B. angast 
Vaillant, J. de C., 1865, p. 110, not of C. & F. 
Compare P. aperta and P. erythrea. 
P. apertTA Linné. PI. 3, figs. 47 to 56. PI. 9, figs. 1, 2,3 gizzard 
plate; 4,5 radula; 6 mouth, radula-sack and stomach seen from 
above; 7 seen from the side. 
Shell squarish-oval, depressed in front, very thin and fragile, 
semitransparent, glossy and iridescent; sculpture, plait-like and 
irregular lines of growth and a few extremely slight and more ir- 
regular spiral lines, which latter are not discernible except with a 
lens and at certain angles of light; the texture examined under a 
microscope resembles curdled milk; color whitish, with sometimes 
two or three clear streaks across the back; spire very loosely coiled, 
with the nucleus extremely small and concealed by a shelly deposit 
from the hinder lobe of the mantle; it is always more or less in- 
dented, and in the young is slightly umbilicate ; mouth roundish- 
oval, of enormous size compared with that of the convoluted portion 
and occupying seven-eighths of the under surface; it is obliquely 
truncated above and rounded below; outer lip dilated, with a sinu- 
ous and very thin edge; the upper part slopes outwards and projects 
considerably beyond the spire; inner corner receding and acute- 
angled; inner lip spread over the pillar, and forming at the angle 
where it meets the outer lip, a thick and shapeless callus; pillar 
sharp and flexuous; there is no umbilical groove or depression. 
(Jeffr.). 
Alt. 21, diam. 17 mill. 
