BARTSCH: NEW ENGLAND PYRAMIDELLIDAE. 105 
Post-miclear whorls almost flattened, somewhat shouldered at the 
summit, crossed by three deeply incised spiral grooves and a faint one. 
The first of these grooves is a little posterior to the periphery; this is 
followed by the weak line, while the two other strong channels are on 
the posterior half between the sutures. These channels are crossed 
by many very weak, axial threads. Sutures feebly impressed. Peri- 
phery of the last whorl slightly angulated. Base well rounded, some- 
what attenuated, marked by about ten feebly incised spiral lines, 
which arc not of uniform strength or spacing. Aperture elongate- 
oval, somewhat effuse anteriorly, posterior angle acute; outer lip 
thin, showing the external sculpture within; columella re-enforced by 
the attenuated base, rather short, reflexed, pro^'ided with a strong 
oblique fold at its insertion. 
The specimen described and figured is one of a lot, cat. no. 83,404 
U. S. N. M., that comes from Massachusetts Bay. It has seven 
post-nuclear whorls and measures : length, 4.0 mm.; diameter, 1.5 mm. 
This species is somewhat variable in the intensity of the spiral 
sculpture. On some, the line described above as faint, appears as 
strong as the rest, i. e., the whorls are then crossed by four deep 
channels between the sutures. In other individuals the second 
channel below the summit appears only as a faint line and even the 
peripheral Qne may be reduced to a mere line; in such instances the 
shell resembles Odostomia (Menestho) bisuturalis. These lines and 
channels, however, are never quite absent, and this leads us to con- 
sider 0. (M.) bisuturalis as distinct. 
The following specimens haA'e been examined : — 
No. of 
Disposition of 
Cat. no. 
spec. 
Locality. 
material. 
129,329 
7 
Newcastle, 
Maine. 
U. S. nat. mus. 
3 
Sheepscott Riv., " 
H. W. Winkley coll. 
83,404 
11 
Massachusetts Bay, Mass. 
U. S. nat. mus. 
83,473 
1 
New Bedford 
, Mass. 
" 
203,799 
3 
Wood's Holl, 
iC 11 tl 
159,087a 
3 
IC u 
n IC a 
9,679 
1 
" " 
Wood's Holl coll. 
203,800 
12 
50 
u 
U. S. nat. mus. 
H. W. Winkley coll. 
203,249 
1 
Weepecket Island, Mass. 
U. S. nat. mus. 
94,844 
3 
Kettle Point, 
Prov. R., R. I. 
" " 
83,474 
11 
New Haven, 
Conn. 
li it li 
203,801 
60 
Branford, 
(( 
U U li 
1000 
(( 
(( 
H. W. Winklev coll. 
