163 
tangement, as well as in the number of the whorls ; which 
in N. glaucina is clearly sis, but in N. intricata no more 
than five can be ascertained- In N. glaucina the second and 
the smaller whorls are more inflated, and form a higher 
spire, the decreasing line of separation having a regular cir- 
cular sweep ; whereas in N. intricata, beside that the whole 
is much more depressed, the spire is not placed in the centre 
of the whorl, but inclined to the superior side. Another 
distinguishing mark is the form and situation of the umbi- 
licus; which in N. glancina is a simple ascending cavity, 
intruded on by a single porcellaneous band, which proceeds 
from the columella. In N. intricata this band is divided 
so nearly into two, that the connection is only by a narrow 
slip; and the eleft or separating gap, which in the smaller 
specimen is rounded and in the larger square, exposes tli3 
Umbilicus above the columella, and therefore passes directly 
inward, instead of obliquely upward as in N • glaucina. 7 lie 
pillar thus becomes exposed uncovered by the band on one 
side and the body whorl on the other, in a mauner to be 
highly characteristic of the adult shell. The inferior portion 
of the hand does not stretch fully across to the whorl, 
but is rounded off by a narrow channel, which proceeds 
circularly to terminate within a short distance of the 
aperture ; offering, in fact, a broad and smooth porcellaneous 
separate termination to the pillar. 
In colour N. intricata is much the most beautiful of Eng- 
lish turbinated shells ; the two specimens differ much in 
tlie depth, though not greatly in the distribution ot their 
tints. In the larger it is far more rich, of a fulvous brown ; 
in the smaller lighter, and of a porcellaneous yellow. The 
smaller whorls arc in the larger somewhat livid ; yellow at 
the separating line: in the larger, a pale yellow; and the 
beauty of the colouring does not begin above the lower half 
of the second whorl ; from which it descends into four regular 
lines, at. nearly uniform distances, to the margin, these 
lines are in their ground lighter than the other portions of 
the surface ; and their margins are well defined ; they are 
also portioned out and intersected, with some regularity, by 
arrow shaped marks; of which those in the two middle are 
the most regular. The two external lines are the widest, 
and their arrow's broader, and more separate, but that which 
> s nearest the separating line ol the whorl most irregular. 
The line nearest the umbilicus (separated from it however, 
by a white space) is iu the smallest specimen ornamented 
Ubth regularly formed arrows, but in the larger one side only 
of this marking appears. The marks here denominated 
arrows are converging lines closing to a point as they de« 
