GASTEROPODA. 261 
adequante: apertura elliptica; labro acuto, intus undecim-striato ; 
columella callosa, concinné corrugata ; sinu siphonali amplo. 
Nassa casta, Goutp; Proceed. Boston Soc. Nat. Hist., ui. 154. 
January 1850. Expedition Shells, 69. 
SHELL small, thin, vitreous in lustre, ovate-conic, apex acuminate ; 
white, with two rusty bands, one around the middle of the last whorl, 
and one near the suture, the colour only appearing in the intervals of 
the ribs. Surface with about fourteen longitudinal, compressed rib- 
folds, extending to the base, crossed by revolving lines, which are suffi- 
ciently apparent about the base and at tip, but are only faintly marked 
between the folds elsewhere. Whorls eight (the three apicial ones 
smooth and vitreous), slightly convex, the last three-fifths the length 
of the shell; siphonal constriction scarcely apparent. Aperture half the 
length of the shell, elliptical ; lip regularly arcuated, with eleven sharp 
strie within; pillar lip deeply concave, finely corrugated, with a pro- 
minent lamina posteriorly ; siphonal notch rather large ; fauces white. 
Length two-fifths of an inch; breadth one-fifth of an inch. 
Inhabits the Pacific Islands. 
This elongated, glistening shell has no one with which it may be 
well compared. It is a little like Bucc. macula, in size and form, but 
in other respects it is more like B. Cuvierz. 
Figures 328, 328 a, dorsal and ventral views of the shell, enlarged ; 
328 b, natural size. 
Nassa Actnosa (Gould). 
T.. solida, ventricosa, ovata, lutescens cinereo obscure fasciata, papillis ¢ 
sulcis volventibus et longitudinalibus equé remotis ubique obsita, serie 
sutural maori: spira conica, anfractibus ad octo plants, dechvibus, 
superné tabulatis, ultimo magno, ventricoso: apertura parva, angusta ; 
labro acuto posticé sinuato, intus quinque ad sex-sulcato ; columella 
valde concava, callo tenui induta ; postice lamelligera, regione siphonali 
plano, albo, sinu amplo, profundo ; fauce fusco-fasciata. 
66 
