Q44 MOLLUSCA. 
Purpura ostTrINA (Gould). 
Testa parva, solida, rudis rotundato-ovata, patula, exalbida, purpuras- 
cens, interdum fasciis geminatis rubidis cincta: spira brevis, conica, 
anfractibus quatuor vel quinque obtuse angulatis, convexis ; ultimo 
amplissimo, ventricoso: apertura rotundato-ovalis, livido-tincta ; labro 
simplict, patente ; columella excavato-planulata ; sinu siphonali angusto, 
minime profundo, breve. 
SHELL small, solid, broad-ovate, purplish, banded with brown lines, 
generally in pairs, faintly marked with the lines of growth, and some- 
times with obtuse revolving ribs. Whorls four or five, obtusely 
angular posteriorly, convex, the last comprising most of the shell, very 
broad-ovate. Aperture large, patulous, oval; outer lip expanding, 
stnooth, simple; pillar broadly flattened, regularly arcuate, chestnut- 
coloured ; aperture livid chestnut, paler near lip. 
Length nearly one inch; breadth three-fifths of an inch. 
Obtained at Killimook, Oregon. 
One of the lapilloid species, but distinguished by its somewhat 
smooth surface, its coloration, and more especially by its peculiarly 
large and patulous aperture and flattened columella. 
Figure 310, ventral view of the shell; 310 a, dorsal view of a faintly 
girdled specimen. 
Purpura T&NIATA (Powis), Proceed. Zool. Soc., Lond. 1835, 96. 
Buccinum teniatum, ReeEve; Conch. Icon., pl. 10, f. 78. 
ANrMaL with the head, lower part of tentacles and siphon, and ante- 
rior edge of the foot, a very rich purplish-brown; tentacles rather 
stout, compressed horizontally, eyes at the superior third, above which 
the tentacles are colourless and taper to the extremity; mantle finely 
incised at the edge; foot cream-coloured, with paler veins, and a longi- 
tudinal median furrow. Operculum large, long, oval, reddish-brown, 
arranged in nearly parallel elements. [3. P. c.] 
