Spirotropis lithocolleta is a species of sea snail, a marine gastropod mollusk in the family Drilliidae.

The 2½ embryonic whorls of the protoconch are cylindrical, quite smooth, and have the extreme point very much flattened down on one side so as to make a perfectly rounded tip.

The body whorl is very slightly tumid with a rounded base, contracting very rapidly to a short broad snout, which is abruptly truncated at the point.

The outer lip is somewhat thickened, with a small reverted edge in the sinus and at the point of the siphonal canal, but sharp and a little contracted in all the rest of its extent.

The columella is straight, short, conical, very little truncated, with a slightly twisted and sharpish edge, and a pretty solid though fine point at the extreme front of the shell.