Cymatosyrinx
Cymatosyrinx is a genus of sea snails, marine gastropod mollusks in the family Drilliidae. The following species have also been found as fossils in the United States and/or in Mexico in the age range: 37.2 to 0.012 Ma: "Cymatosyrinx aclinica" (alternative combination: "Cymatosyrinx lunata aclinica"), "Cymatosyrinx dorseyi" , "Cymatosyrinx limatula" (synonyms: "Drillia limatula", "Pleurotoma limatula"), "Cymatosyrinx lunata" , "Cymatosyrinx magnoliana" , "Cymatosyrinx mariana" , "Cymatosyrinx perpolita" , "Cymatosyrinx tiara" , "Cymatosyrinx ziczac" . Description. This genus includes the thin-shelled light-colored species, previously included in "Drillia" The shell is generally short and stout, the spire often very short. The whorls contain nodulous axial ribs, extending  over the whole of the volutions. They are generally without spiral sculpture, or, if present, very weak. The aperture is subrhomboidal, very little narrowed below, with a short and broad siphonal canal. The outer lip is arched, with a shallow sinus towards the suture. The inner lipis large and callous. Species. Species within the genus "Cymatosyrinx" include: