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-H ; 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. (Issel). 



Suez, etc., (Issel). 



P. vaillanti ISSEL, Mai. Mar Rosso, p. 166, (1369).==5. angasi 

 Vaillant, J. de C., 1865, p. 110, not of C. & F. 



Compare P. aperta and P. erythrcea. 



P. APERTA Linne. 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 umlpihcate ; 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. 



