Urosalpinx verrilli
Urosalpinx verrilli is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.
Description
The length of the shell attains 9 mm; of the aperture, 4.5 mm; maximum diameter, 4.5 mm.The small, white, fusiform shell has a smooth white protoconch of about one smooth small whorl followed by a second minutely reticulate whorl, on which the spiral threads are stronger, increasing in strength to the end of the protoconch. It is followedby three subsequent well rounded whorls. The suture is distinct and deep, not appressed. The axial sculpture consists of narrow rounded ribs crossing the whorls, with wider interspaces. The incremental lines are fine even, closely adjacent, and of a silky texture. The ribs are obsolete on the base of the body whorl. The spiral sculpture consistsof equal and equally spaced rounded cords with subequal interspaces and 10 or more close-set simple cords on the base. The former are slightly swollen at their intersections with the ribs. The aperture is semilunate. The outer lip is thin, smooth internally, the body erased. The columella is short and twisted. The siphonal canal is short and recurved. The axis is impervious.