258 MOLLUSCA. 
dered above, the upper ones nearly plane, the last subglobose two- 
thirds the length of the shell; suture canaliculate. Aperture half the 
length of the shell, oval; lip sharp, regularly arched; pillar margin 
moderately arcuated, with a sharp lamina posteriorly near the angle, 
and the remainder finely and irregularly folded, terminating at the 
notch in a thin, sharp, ascending tooth; siphonal notch very deep, 
oblique, the left margin produced into a thin delicate lamina; interior 
sulcated, dusky in the channels, except near margin; callus scanty, 
not appressed. 
Length seven-tenths of an inch; breadth three-eighths of an mch. 
Inhabits Tutuilla, Samoa Islands. 
This species resembles N. musiva, in surface and colour, but the 
spire is longer and more turreted, and there is merely a mottling of 
colours, without any definite arrangement. ‘The specimens actually 
obtained by the Expedition are of the size represented with the 
animal, but they appear to be identical with larger specimens in my 
own cabinet. 
Figure 325, ventral view of the shell; 325 a, the animal, with the 
shell, as in crawling ; 325 4, the animal, from beneath. 
Nassa curta (Gould ). 
T. abbreviata, ovato-conica, lutescens interdum rufo subfasciata, sub- 
spinosa, longitudinaliter plicata ; plicis ad tredecim tenuibus, acutis, 
liris conspicuis decussatis: spira conica, anfractibus sex convexius- 
cults ; ultimo globoso octantes quinque longitudinis teste adequante : 
apertura rotundato-ovalis ; labro crenulato, intus sulcato, extrorsum 
incrassato ; columella callo copioso granuloso induta ; sinu siphonah 
angusto, profundo. 
Nassa curta, Goutp; Proceed. Boston Soc. Nat. Hist., iii. 153. 
January 1850. Expedition Shells, 69. 
SHELL small, rather thin, short, ovate-conic, folded throughout with 
about thirteen sharp, moderately elevated, longitudinal folds, decus- 
