Shell of medium size, 28-50 mm., elongate fusiform, very slender, with a tall spire and narrow body-whorl, gradually tapered to a long straight unnotched anterior canal. Protoconch proportionately large, narrowly conical of 3-4 smooth regular whorls. subsutural margining very narrow. Sculpture initiated, and dominated throughout by spiral cords. Range -- Late Cretaceous of Mississippi and Texas, confined to the "Exogyra costata zone".