Mirarissoina histia is a species of small sea snail, a marine gastropod mollusc in the family Zebinidae.
Description The shell is 11 mm in size.
(Original description) The shell is minute, highly polished, and milk-white. The whorls in the protoconch number a little more than one; they are smooth and well rounded. The nine postnuclear whorls are moderately rounded, appressed at the summit, and polished; they are marked only by exceedingly fine, microscopic incremental lines. The sutures are moderately impressed.
The periphery of the body whorl is well rounded and marked by a single incised line. The base is moderately long and well rounded, with a strong anterior fasciole; it is polished and marked by a single incised line situated slightly anterior to the peripheral line, which it equals in length.
The aperture is very irregular in outline and oblique, with an anterior and a posterior siphonal canal. The outer lip is claw-shaped, twisted, and sinuous; it bears a small projection in the middle of the basal line, which is reinforced immediately behind by a strong varix. The inner lip is thin and appressed to the base, with which it becomes completely fused; the continuation of the curved basal fasciole is responsible for the projection on the basal lip.
Distribution This species has been found off the west coast of America.
References
External links Denver Museum of Nature & Science: image