Facts
Appearance:
The Olive Vertigo's "Shell is minute, dextrorse, ovate
with the apex rather acute, rimate; thin, transparent, of rather
dark brown color with a slight greenish tinge [dark olive buff].
Whorls 4 1/2, rather rapidly increasing, separated by a
moderately deep suture, the last comparatively large, occupying
over one-half of altitude, rounded; with a slight impression
over the palatal fold; aperture well rounded, truncate, the
margins slightly everted, the outer margin barely impressed at
the auricle which is marked by a slight angle projecting over
the level of the peristome; no callus in the palate; lamellae
and folds three or four, small, very short, of brownish color;
the parietal, columellar and inferior palatal, and sometimes
there is also a superior palatal. Surface is very fine,
irregular striae, somewhat shining. Alt. 1.5 to 1.6 mm, dia. 1.1
mm, aperture, alt 0.6 mm." (Tryon 1918)