78 DESCRIPTIONS. 
front and not more than half-way down behind, raised into 
blunt nodules at the sutures, aperture semi-lunate, columella 
thickened but not spreading, tubercular, outer lip very thick, 
with a thin edge near the aperture; throat with rather 
strong and somewhat distant ridges, canal very short, stained 
on each side of the base with brown. 
This may be only a variety of that interminable shell, N. 
incrassata, Miill., but I have not seen any varieties that are likely 
to connect them. 
854 N. picturata, Marrat.—Shell ovately-conical, glossy, rather 
broad at the base, white, with numerous transverse brown 
bands, the central one being the most distinct, apex purple, 
whorls rounded,somewhat angular below the sutures, strongly 
ribbed longitudinally and closely grooved transversely, sutures 
only represented by a fine line, the penult-whorl is angularly 
noduled, aperture oval, columella defined, plicate, outer lip 
thick, within plicate. 
This may be only a large variety of N. versicolor, C. B. Adams. 
The nearest shell figured is one in Kiener, at plate 21, figure 81, 
under the title of N. ambigua, Montague. Our shell is twice as 
large as Kienev’s figure. 
N. acuminata, Marrat.—Shell acuminately-oblong, of a pale 
ash-brown colour, banded with pale brown, whorls obliquely 
rounded, grooved near the base of the last whorl, strongly 
coronated at the sutures, sutures canaliculate, the six or 
seven upper whorls strongly ribbed, the penult semicostate, 
aperture oval, columella with a thin spreading callous, 
outer lip thickened, thin on the edge and spiny at the base, 
throat plicate. 
An intermediate form connecting the smooth shells of N. 
trifasciata, Gmel., with the N. scalaris, A. Ad. 
Obs. 
into N. trifasciata, Gmel., on the one hand, into the N. scalaris, 
A. Ad., on the other. 
N. ferruginea, Marrat.— About three-quarters of an inch long ; 
Another shell is quite smooth and shows the passage 
it is similar in form to some of the smaller varieties of N, 
