108 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
two other immature specimens, cat. no. 126,546 U. S. N. M., are from 
Wiscasset, Maine. 
Odostomia Fleming s. s. 
Odostomia Fleming, Edinburgh encyclop., vol. 7, pt. 1, p. 76, 1813,= Odon- 
tostomia Jeffreys, 1839, = Ptychostomon Locard, 1886, = Turritodostomia 
Sacco, 1892. 
Axial and spiral sculpture absent, the latter sometimes indicated by 
exceedingly fine microscopic spiral striations. Columellar fold 
present. 
T}^e, Turbo ■plicatus Montagu. 
Odostomia (Odostomia) modesta (Stimpson). 
PL 13, fig. 50. 
Chemnitzia modesta Stimpson, Proc. Boston soc. nat. hist., vol. 4, p. 16, 
1851. 
Shell thick, ovate, yellowish white, shining. Nuclear whorls small, 
obliquely completely immersed in the first of the succeeding turns. 
Post-nuclear whorls inflated, the summit with well rounded shoulders. 
Periphery of the last whorl obscurely angulated. Base rather in- 
flated, well rounded. Sutures well impressed. Entire surface 
marked by only fine lines of growth and exceedingly fine indistinct 
spiral striations. Aperture broadly oval, very slightly effuse ante- 
riorly, posterior angle acute; outer lip thick within, edge thin; col- 
umella stout, decidedly curved, strongly reflexed over the re-enforcing 
base (which gives it a slight umbilical chink at its posterior extremity) 
and proA-ided with a strong oblique fold at its insertion; parietal wall 
covered by a wavy thin callus. 
The specimen described, cat. no. 203,812 U. S. X. j\I., was collected 
at "Wood's Holl, Mass. It has five post-nuclear whorls and measures: 
length, 3.2 mm.; diameter, 1.8 mm. 
Another specimen, a young indi^^dual from the same locality, is in 
Rev. H. W. Winkley's collection. 
Odostomia (Odostomia) dealbata (Stimpson). 
Chemnitzia dealbata Stimpson, Proc. Boston soc. nat. hist., vol. 4, p. 114, 
1851,= Odostomia dealbata Binney-Goiild, Invert, of Mass., p. 327, fig. 595, 
1870. 
