MUSEUM OF COMPARATIVE ZOOLOGY. 219 
with the posterior edge of the lip ; the innermost one forms the border of the 
umbilicus, and is usually surmounted by a series of small, blunt tubercles 
formed by the crossing of the lines of growth; the outer three or four carinz 
are usually more or less distinctly crenulated where they are crossed by the 
lines of growth, which are very distinct, and have the form of raised, rounded 
ridges in the interspaces, and increase in prominence toward the umbilicus. 
Above the line of the suture on the lower whorls there are two, or sometimes 
three, prominent revolving carine, which are regularly covered with promi- 
nent, subacute tubercles or denticulations, which vary considerably in num- 
ber, prominence, and thickness. In the more common form, with the larger 
tubercles, there are on the body whorl about twenty-five to thirty tubercles on 
each carina, in other specimens forty, and in one case there are as many as 
sixty very small ones. The interspaces are broad, flattened, or even concave 
when the carine are very prominent. The whole surface is usually crossed by 
numerous oblique, distinctly raised, unequal lines of growth, of which the 
more prominent, in crossing the caring, form the tubercles. On the upper 
whorls the lines of growth are less distinct than on the lower, and sometimes 
scarcely obvious except close to the carine ; in such specimens the middle of 
the interspaces is nearly smooth and iridescent. The nucleus is prominent, the 
apical whorl being slightly upturned, rounded, smooth and white ; the second 
and third whorls are crossed by raised transverse ribs, and the revolving cari- 
nz become distinct on the third whorl. The umbilicus is large, deep funnel- 
shaped, showing the volutions, bordered by a distinctly tuberculated carina, 
and covered, on the inner surface, by very regular and prominent sharp lines 
of growth, which become crowded within. Aperture nearly round, except 
where slightly notched beneath the carine; columella lip slightly excurved 
over the upper part of the umbilicus. In fresh specimens the surface is some- 
times partially covered by a very thin, brownish yellow epidermis, which 
easily peels off, leaving the shell beautifully iridescent ; inner surface pearly 
white. Operculum circular, thin, pale yellow. 
‘¢ Height, 22 mm.; breadth, 19 mm. Another specimen measures, in height, 
21 mm. ; breadth, 19.5 mm.” 
Ganesa sp. 
VERRILL, Trans. Conn. Acad., VI. p. 201, 1884. 
One dead specimen, Station 307, east of George’s Bank, in 980 fathoms. 
Puncturella sp. 
A very much worn and broken specimen, Station 321, off Charleston, S. C., 
in 233 fathoms. 
Although so imperfect, this specimen is of interest in being the only one of 
this genus in the collection, and also in being quite distinct from P. noachina. 
