96 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
which are more crowded about the umbihcal area than at the pe- 
ripheral part of the base. Aperture small, oval, posterior angle acute; 
outer lip thin, showing the external sculpture within; columella short, 
slender, and very strongly curved. 
The type and two additional specimens, cat. no. 203,795 U. S. N. M., 
come from Casco Bay, Maine. The type has lost the nucleus and 
probably the first post-nuclear turn; the ten remaining whorls measure: 
length, 7.3 mm.; diameter, 2.0 mm. 
Turbonilla (Pyrgiscus) edwardensis new species. 
PL 12, figs. 20, 25. 
Shell slender, elongate-conic, yellow. Nuclear whorls small, one 
and one half, ha^^ng their axis at right angles to that of the suc- 
ceeding turns, and slightly immersed in the first of these. Post- 
nuclear whorls well rounded, faintly shouldered at the summit, marked 
by irregular, retractive obsolete axial ribs, which are very ill defined 
on the last turns. The spiral sculpture between the sutures consists 
of five strongly incised continuous lines and one feeble one. The 
feeble line divides the space between the second and third strong 
spirals. The space enclosed between the first and second spirals is 
equal to that between the fifth and sixth and these are considerably 
wider than the others which are subequal. Periphery well rounded.^ 
Base inflated, well rounded, marked by the obsolete riblets and about 
13 well incised spiral lines of varying strength and spacing. Aperture 
oval, outer lip thin, showing the external sculpture within; columella 
very slender and strongly curved. 
The t\^e, cat. no. 203,794 U. S. N. M., and one other specimen 
come from Prince Edward Island. The type has nine post-nuclear 
whorls and measures: length, 5.2 mm.; diameter, 1.5 mm. 
ODOSTOMIA Fleming. 
Odostomia Fleming, Edinburgh encyclop., vol. 7, pt. 1, p. 76, 1813, = 
Odontostomia .Jeffreys, 1839,= Ptychostomon Locard, 1886,= Turritodostomia 
Sacco, 1892. 
Shell usually short, few whorled, subconic or ovate, columellar fold 
single, var}dng in strength, outer lip entire. 
T}'pe, Turbo plicatus Montagu. 
