GASTEROPODA. 265 
Nassa rubricata, Goutp; Proceed. Boston Soc. Nat. Hist., 111. 155. 
January 1850. Expedition Shells, 70. 
SHELL small, solid, conic-ovate, with about fifteen to twenty longi- 
tudinal rib-like folds, which become oblique on the last whorl, and 
gradually shorten until they nearly disappear near the aperture ; these 
are decussated by threadlike, impressed striew, about five on the upper 
whorls and ten on the last, besides a deep canal around the siphonal 
region; the upper stria is generally more deep than the others, and 
produces a sutural range of gemmules. Whorls six, conico-convex, 
the last two-thirds the length of the shell, and rather ventricose at 
base; aperture not quite half the length of the shell, rounded-ovate, 
pure white; outer lip short-arcuate, with very fine internal sulcations ; 
pillar lip rounded and polished, callus not abundant; epidermis fawn- 
coloured, colour pale-yellowish, with the spaces between the strie 
coloured with reddish-brown bands, generally interrupted as they 
cross the ribs; siphonal canal short and rather shallow. 
Length five-eighths of an inch; breadth one-third of an inch. 
Its habitat is a little uncertain, but probably is the Pacific coast of 
America. 
I know not any species with which to compare this, except, per- 
haps, Bucc. corrugatum, from which it differs in its aperture. Its 
elongated form, oblique folds on the outer whorl, and its white aper- 
ture, are its most conspicuous points. When deprived of its epidermis, 
the revolving fawn-coloured lines interrupted by the ribs give quite a 
distinctive character. 
Figures 332, 332 a, two views of the shell, natural size. 
Nassa LiLactNa (Gould). 
T. parva, ovato-conica, levigata, llacina: spira acuta, anfractibus 
septem ad octo convexis, ad suturam crenulatis, supernis plicatis et 
stris volventibus cinctis ; ultimo dimidiam longitudinis teste ade- 
quante, bast spiraliter striato: apertura lunata; labro simplict ; sinu 
stphonah amplo, breve. 
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