Fusiform, elongate in Shape with largely emarginated notch at postero-ventral corner. Convex medial face and concave lateral face. Dorsal depression deep. Dorsal margin and ventral margin dentate, serrate. Sulcus ostial, deep. Ostium flared, reduced. Cauda elongate, slightly bulbous and flexed ventrally at posterior. Colliculum in the middle of sulcus. Collum large, wall-like. Crista superior and crista inferior well-developed, both poorly-developed at posterior. Neck slightly dorsally constricted. Rostrum very extended, bar-like. Excisura wide. Notch deep.