Shell small, light brown, with slightly sunken apex; 3,5 whorls, the first one and a fourth nuclear and smooth. Suture well impressed. There are two strongly nodulous spiral cords at the periphery. On the upper surface straight retractively radial ribs connect the nodes of the upper peripheral cord with those of the one just below the suture. As there are twice as many nodes on the outer cords as on the subsutural, alternate ribs are spaced between the nodes of the subsutural cord. Base well rounded, openly umbilicated, with axial ribs converging to a spiral groove; next to a row of strong nodules on the umbilical cord. About five impressed spiral lines cut the axial ribs on the base. In young shells the second row of spiral nodes from the umbilicus is much more prominent. Height 1.6 mm., diam. 4.3 mm. Mazatlan, Mexico
This shell is about the same size as H. panamensis Bartsch, but with en¬tirely different sculpture. It is smaller and flatter than H. mazatlanicus.