66 AMERICAN MARINE CONCHOLOGY. 
half the total length; aperture narrow, produced in front; colu- 
mella with a minute posterior plica. 
Length 5, diam. 2 mill. 
South Carolina. 
It has the aperture, and in general the sculpture of Chemnitzia, 
with the columellar fold of Odostomia. 
‘4. T. suruRALIS, Gould. 
(Dunkeria.) Bost. Proc., viii. 280. 1862. 
Shell minute, ivory white, turreted ; whorls seven to eight, con- 
vex, with ten to twelve longitudinal plications (evanescent above) 
and thin revolving striz, of which a subsutural one is well im- 
pressed; last whorl less than half the total length; aperture 
’ lunate, small. 
Length 3, diam. 1 mill. 
Fort Johnson, Charleston, 8S. C. 
Genus ODOSTOMIA, Fleming. 
Brit. Anim. 297, 310. 1828. 
This genus consists of small, usually white, smooth, solid and 
enamelled shells, with the inner lip always toothed ; they range 
from low-water to forty fathoms. 
1. O. propucTa, Adams. Fig. 114. 
(Jaminea.) Bost. Journ. Nat. Hist., iti. 322, t. 3, f 8. 1840. 
Shell small, conic-cylindrical; whorls eight, nearly flat; epi- 
dermis light-brown ; columella flexuous. 
Length 5 millimetres. 
More slender than O. fusca, with one or two more whorls, 
which are less convex and with no approach to an umbilicus. 
Massachusetts. 
2. O. FuscA, Adams. Fig. 115. 
(Pyramis.) Bost. Journ. Nat. Hist., ii. 282, t. 4, f. 9. 1839. 
Shell small, subelongate, conical ; spire truncate, obtuse ; whorls 
six, convex ; suture strongly impressed, and with a revolving line 
below it, causing it to appear double. Aperture broadly ovate, 
acutely angular above, dilated in the middle. Fold on the pillar- 
lip far within, occasionally double, and in some cases obsolete ; an 
umbilical indentation about the middle of the left lip. Epidermis 
shining brown. 
Length 6 mill. 
New England ; New York. 
