256 MOLLUSCA. 
lunate; lip sharp, slightly curved, having six sharp plaits within; 
pillar granular-rugose, covered with callus; mouth white. 
Length five-eighths of an inch; breadth three-tenths of an inch; 
length of the aperture three-tenths of an inch. 
Found at Kauai, Sandwich Islands. 
This little muriciform species is quite pretty. It belongs to Mr. 
Gray’s genus Pollia. 
Figures 313, 313 a, two views of the shell. 
Nassa mustiva (Gould). 
Testa solida, ovato-conica, polita, albido et olivaceo marmorata, coloribus 
in maculis quadratis tessellatim dispositis: spira conica, anfractibus 
sex ad septem convexis, bene discretis, ultimo trientes duos longitudinis 
testa, prope labrum pallidiort, longitudinaliter plicato et lineolis oliva- 
ceis cincto: apertura dimidiam longitudinis teste, ovalis, postice cana- 
liculata ; columella valde arcuata, oblique sulcatd ; labro intus sulcato, 
sulcis fuscatis. 
Nassa musiva, Goutp; Proceed. Boston Soc. Nat. Hist., iii. 153. 
January 1850. Expedition Shells, 68. 
SHELL ovate, elongated, apex acuminated, solid, highly polished 
and shining, absolutely destitute of stric, except two linear, revolving 
grooves around the siphonal notch, and four or five longitudinal folds 
just behind the lip; the three apicial whorls also are plaited. Colour 
clouded white and olivaceous, the clouding composed of minute quad- 
rate spots arranged in revolving series, in some parts articulated, the 
several series distinctly bounded by olivaceous threads, especially 
towards the aperture, where the general colouring is also paler, and 
the whole resembling fine mosaic work. Whorls six to seven, rather 
ventricose, forming a very narrow shoulder at the suture, which is 
deeply impressed ; the last whorl three-fourths the length of the shell. 
Aperture half the area of the shell, oval, the outer lip somewhat in- 
cumbent posteriorly, so as to form a posterior fissure at the angle, 
