98 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
24 upon the 4th and the penuUimate whorl. In addition to the ribs, 
there are four low, broad, spiral ridges which divide the space between 
the sutures into four ec^ual areas, one of which is at the periphery 
and one at the summit, while the remaining two divide the space 
between them. Spaces between the spiral ridges about one sixth 
as wide as the ridges. The junctions of the spirals and the axial ribs 
form the nodules. Sutures channelled. Periphery and base of the 
last whorl inflated, marked by about seven strongly incised spiral 
grooves which are a little more distantly spaced near the periphery 
than the umbilical area. Spiral grooves crossed by many slender 
lirations. Aperture irregularly auriculate, effuse at the junction of 
the outer lip and columella, posterior angle very obtuse; outer lip 
rather thick within, thin at the edge, showing the external sculpture 
within; columella strong, decidedly twisted and reflexed, re-enforced 
throughout almost its entire length by the attenuated base, pro\ided 
with a strong oblique fold near its insertion which becomes enfeebled 
as it approaches the visible part of the aperture; parietal wall covered 
by a faint callus. 
The specimen described is one of a lot from Vineyard Sound, cat. 
no. 159,098 U. S. N. M., has six post-nuclear whorls, and measures: 
length, 3.8 mm.; diameter, 1.8 mm. 
The following specimens have been examined: — 
No. of 
U.S.F.C 
Depth 
Disposition of 
Cat no. spec. 
sta. 
Locality. 
(fms.). 
Temp. 
material. 
159,092 
11 
North of No Man's 
Land, Mass. 
U. S. nat. mus. 
159,100 
2 
Buzzards Bay, Mass. 
a a a 
159,096 
3S 
Quisset, " 
a a a 
790a 
721 
1 
1 
30 
Wood's Holl, 
li a it 
Wood's Holl coll. 
8 
li li a 
H. W. Winkley coll. 
159,09.3 
1 
1205- 
(oft- 
East Chop) 
11 
72° 
U. S. nat. mus. 
159,098 
58 
Vineyard Sound, Mass. 
a a a 
159,099 7 
159,095 32 834 Sakonnet Riv., R. I. 11 71° 
159,094 1 835 " " " 3 71° 
159,097 1 798 Off Newport, " 12 59° 
1 Branford Riv., Conn. H. W. Winkley coll. 
94,849 2 Mass. U. S. nat. mus. 
97,510 3 East coast of U. S. 
55,213 1 a ii a a (^) a a a 
